diff --git a/src/interface.jl b/src/interface.jl
index 0a8d62a..a6f881c 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -265,7 +265,8 @@ julia>
 
 # Signature
 """
-function evaluator(a::T1, state::T2)::Tuple{String, Integer} where {T1<:agent, T2<:AbstractDict}
+function evaluator(config::T1, state::T2
+  )::Tuple{String, Integer} where {T1<:AbstractDict, T2<:AbstractDict}
   
   systemmsg = 
   """
@@ -342,19 +343,19 @@ function evaluator(a::T1, state::T2)::Tuple{String, Integer} where {T1<:agent, T
     """
 
   pprint(prompt)
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
 
 
   # apply LLM specific instruct format
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
 
   msgMeta = GeneralUtils.generate_msgMeta(
     externalService[:mqtttopic],
     senderName= "evaluator",
-    senderId= a.id,
+    senderId= string(uuid4()),
     receiverName= "text2textinstruct",
-    mqttBroker= a.config[:mqttServerInfo][:broker],
-    mqttBrokerPort= a.config[:mqttServerInfo][:port],
+    mqttBroker= config[:mqttServerInfo][:broker],
+    mqttBrokerPort= config[:mqttServerInfo][:port],
   )
 
   outgoingMsg = Dict(
@@ -377,7 +378,7 @@ function evaluator(a::T1, state::T2)::Tuple{String, Integer} where {T1<:agent, T
       Here is an expected JSON format:
       {"evaluation": "...", "score": "..."}
       """
-      responseJsonStr = jsoncorrection(a, _responseJsonStr, expectedJsonExample)
+      responseJsonStr = jsoncorrection(config, _responseJsonStr, expectedJsonExample)
       evaluationDict = copy(JSON3.read(responseJsonStr)) 
 
       # check if dict has all required value
@@ -671,7 +672,7 @@ julia>
 
 # Signature
 """
-function reflector(a::T1, state::T2)::String where {T1<:agent, T2<:AbstractDict}
+function reflector(config::T1, state::T2)::String where {T1<:AbstractDict, T2<:AbstractDict}
   # https://github.com/andyz245/LanguageAgentTreeSearch/blob/main/hotpot/hotpot.py
 
   _prompt = 
@@ -727,7 +728,7 @@ function reflector(a::T1, state::T2)::String where {T1<:agent, T2<:AbstractDict}
   """
 
   # apply LLM specific instruct format
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
   llminfo = externalService[:llminfo]
   prompt = 
   if llminfo[:name] == "llama3instruct"
@@ -739,10 +740,10 @@ function reflector(a::T1, state::T2)::String where {T1<:agent, T2<:AbstractDict}
   msgMeta = GeneralUtils.generate_msgMeta(
   a.config[:externalservice][:text2textinstruct][:mqtttopic],
   senderName= "reflector",
-  senderId= a.id,
+  senderId= string(uuid4()),
   receiverName= "text2textinstruct",
-  mqttBroker= a.config[:mqttServerInfo][:broker],
-  mqttBrokerPort= a.config[:mqttServerInfo][:port],
+  mqttBroker= config[:mqttServerInfo][:broker],
+  mqttBrokerPort= config[:mqttServerInfo][:port],
   )
 
   outgoingMsg = Dict(
@@ -765,7 +766,7 @@ function reflector(a::T1, state::T2)::String where {T1<:agent, T2<:AbstractDict}
       Here is an expected JSON format:
       {"reflection": "..."}
       """
-      responseJsonStr = jsoncorrection(a, _responseJsonStr, expectedJsonExample)
+      responseJsonStr = jsoncorrection(config, _responseJsonStr, expectedJsonExample)
       reflectionDict = copy(JSON3.read(responseJsonStr)) 
 
       # check if dict has all required value
@@ -791,45 +792,100 @@ function transition()
 end
 
 
-# """ Determine whether the state is a terminal state
 
-# # Arguments
-#   - `state::T`
-#     a game state
-  
-# # Return
-#   - `(isterminalstate, reward)::Tuple{Bool, <:Number}`
 
-# # Example
-# ```jldoctest
-# julia> 
-# ```
+""" Get a new state
 
-# # TODO
+# Arguments
+  - `a::T1`
+    one of YiemAgent's agent
+  - `state::T2`
+    current game state
+  - `thoughtDict::T3`
+    contain Thought, Action, Observation
+  - `isterminal::Function`
+    a function to determine terminal state
 
-# # Signature
-# """
-# function isterminal(state::T)::Tuple{Bool, <:Number} where {T<:AbstractDict}
-#   latestObservationKey, _ = GeneralUtils.findHighestIndexKey(state[:thoughtHistory], "observation")
-#   latestObservation = state[:thoughtHistory][latestObservationKey]
+# Return
+  - `(newNodeKey, newstate, isterminalstate, reward)::Tuple{String, Dict{Symbol, <:Any}, Bool, <:Number}`
 
-#   if latestObservation !== nothing
+# Example
+```jldoctest
+julia> state = Dict{Symbol, Dict{Symbol, Any}}(
+          :thoughtHistory => Dict(:question => "Hello, I want to buy a bottle of wine."), 
+          :storeinfo => Dict(), 
+          :customerinfo => Dict()
+          )
+julia>  thoughtDict = Dict(
+          :question=> "I want to buy a bottle of wine.",
+          :thought_1=>  "The customer wants to buy a bottle of wine.",
+          :action_1=>   Dict{Symbol, Any}(
+                          :name=>"Chatbox", 
+                          :input=>"What occasion are you buying the wine for?",
+                          ),
+          :observation_1 => ""
+          )
+```
 
-#     # terminal condition is when the user select wine by putting <<winename>> in latest observation 
-#     if occursin("<<", latestObservation) && occursin(">>", latestObservation)
-#       isterminalstate = true
-#       reward = 1
-#     else
-#       isterminalstate = false
-#       reward = 0
-#     end
-#   else
-#     isterminalstate = false
-#     reward = 0
-#   end
+# TODO
+  - [] add other actions
+  - [WORKING] add embedding of newstate and store in newstate[:embedding]
+
+# Signature
+"""
+function transition(config::T1, state::T2, decisionMaker::Function, evaluator::Function, 
+  reflector::Function
+  )::Tuple{String, Dict{Symbol, <:Any}, Integer} where {T1<:AbstractDict, T2<:AbstractDict}
+
+  thoughtDict = decisionMaker(config, state)
+
+  actionname = thoughtDict[:action][:name]
+  actioninput = thoughtDict[:action][:input]
+
+  # map action and input() to llm function
+  response, select, reward, isterminal =
+  if actionname == "chatbox"
+    # deepcopy(state[:virtualCustomerChatHistory]) because I want to keep it clean
+    # so that other simulation start from this same node is not contaminated with actioninput
+    virtualWineUserChatbox(config, actioninput, deepcopy(state[:virtualCustomerChatHistory]))  # virtual customer
+  elseif actionname == "winestock"
+    winestock(config, actioninput)
+  elseif actionname == "recommendbox"  
+    virtualWineUserRecommendbox(config, actioninput)
+  else
+    error("undefined LLM function. Requesting $actionname")
+  end
+
+  newNodeKey, newstate = LLMMCTS.makeNewState(state, thoughtDict, response, select, reward, 
+                                            isterminal)
+  if actionname == "chatbox"
+    push!(newstate[:virtualCustomerChatHistory], Dict(:name=>"assistant", :text=> actioninput) )
+    push!(newstate[:virtualCustomerChatHistory], Dict(:name=>"user", :text=> response))
+  end
+
+  stateevaluation, progressvalue = evaluator(config, newstate)
+
+  if newstate[:reward] < 0
+    pprint(newstate[:thoughtHistory])
+    newstate[:evaluation] = stateevaluation
+    newstate[:lesson] = reflector(config, newstate)
+
+    # store new lesson for later use
+    lessonDict = copy(JSON3.read("lesson.json"))
+    latestLessonKey, latestLessonIndice = 
+      GeneralUtils.findHighestIndexKey(lessonDict, "lesson")
+    nextIndice = latestLessonKey == :NA ? 1 : latestLessonIndice + 1
+    newLessonKey = Symbol("lesson_$(nextIndice)")
+    lessonDict[newLessonKey] = newstate
+    open("lesson.json", "w") do io
+      JSON3.pretty(io, lessonDict)
+    end
+    print("---> reflector()")
+  end
+
+  return (newNodeKey, newstate, progressvalue)
+end
 
-#   return (isterminalstate, reward)
-# end
 
 
 """ Chat with llm.
@@ -960,58 +1016,6 @@ end
 
 
 
-# function conversation(a::T, userinput::Dict) where {T<:agent}
-
-#   # get new user msg from a.receiveUserMsgChannel
-  
-
-#   # "newtopic" command to delete chat history
-#   if userinput[:text] == "newtopic"
-#     clearhistory(a)
-
-#     return "Okay. What shall we talk about?"
-
-#   else
-#     # add usermsg to a.chathistory
-#     addNewMessage(a, "user", userinput[:text])
-
-#     currentstate = 
-#     if isempty(a.plan[:currenttrajectory])
-#       # set up initial state
-#       Dict{Symbol, Any}(
-#       # deepcopy the info to prevent modifying the info unintentionally during MCTS planning
-#       :customerinfo=> deepcopy(a.keywordinfo[:customerinfo]),
-#       :storeinfo=> deepcopy(a.keywordinfo[:storeinfo]),
-#       :userselect=> nothing,
-#       :reward=> 0,
-#       :isterminal=> false,
-#       :evaluation=> nothing,
-#       :lesson=> nothing,
-#       :thoughtDict=> nothing,
-#       :totalTrajectoryReward=> nothing,
-#       :thoughtHistory=> OrderedDict{Symbol, Any}( # contain question, thought_1, action_1, observation_1, thought_2, ...
-#         # :recap=>,
-#         :question=> userinput[:text],
-#         )  
-#       )
-#     else
-#       a.plan[:currenttrajectory]
-#     end
-
-#     bestNextState, besttrajectory = runMCTS(a, currentstate, decisionMaker, evaluator, reflector,
-#                             totalsample=3, maxDepth=2, maxiterations=1, explorationweight=1.0)
-    
-#     # transition
-#     newstate = transition(a, bestNextState)
-#     a.plan[:currenttrajectory] = newstate
-
-#   end
-# end
-
-
-
-
-
 
 
 
diff --git a/src/llmfunction.jl b/src/llmfunction.jl
index c169929..612a3e8 100644
--- a/src/llmfunction.jl
+++ b/src/llmfunction.jl
@@ -3,7 +3,7 @@ module llmfunction
 export  virtualWineUserChatbox, jsoncorrection, winestock,
         virtualWineUserRecommendbox, userChatbox, userRecommendbox
 
-using HTTP, JSON3, URIs, Random, PrettyPrinting
+using HTTP, JSON3, URIs, Random, PrettyPrinting, UUIDs
 using GeneralUtils
 using ..type, ..util
 
@@ -168,8 +168,8 @@ julia>
 
 # Signature
 """
-function virtualWineUserChatbox(a::T1, input::T2, virtualCustomerChatHistory
-  )::Union{Tuple{String, Number, Number, Bool}, Tuple{String, Nothing, Number, Bool}} where {T1<:agent, T2<:AbstractString}
+function virtualWineUserChatbox(config::T1, input::T2, virtualCustomerChatHistory
+  )::Union{Tuple{String, Number, Number, Bool}, Tuple{String, Nothing, Number, Bool}} where {T1<:AbstractDict, T2<:AbstractString}
 
   previouswines = 
   """
@@ -275,16 +275,16 @@ function virtualWineUserChatbox(a::T1, input::T2, virtualCustomerChatHistory
     """
 
   pprint(prompt)
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
 
   # send formatted input to user using GeneralUtils.sendReceiveMqttMsg
   msgMeta = GeneralUtils.generate_msgMeta(
     externalService[:mqtttopic],
     senderName= "virtualWineUserChatbox",
-    senderId= a.id,
+    senderId= string(uuid4()),
     receiverName= "text2textinstruct",
-    mqttBroker= a.config[:mqttServerInfo][:broker],
-    mqttBrokerPort= a.config[:mqttServerInfo][:port],
+    mqttBroker= config[:mqttServerInfo][:broker],
+    mqttBrokerPort= config[:mqttServerInfo][:port],
     msgId = "dummyid" #CHANGE remove after testing finished
   )
 
@@ -310,7 +310,7 @@ function virtualWineUserChatbox(a::T1, input::T2, virtualCustomerChatHistory
         "isterminal": "..."
       }
       """
-      responseJsonStr = jsoncorrection(a, _responseJsonStr, expectedJsonExample)
+      responseJsonStr = jsoncorrection(config, _responseJsonStr, expectedJsonExample)
       responseDict = copy(JSON3.read(responseJsonStr)) 
 
       text::AbstractString = responseDict[:text]
@@ -362,8 +362,8 @@ julia> result = winestock(agent, input)
 
 # Signature
 """
-function winestock(a::T1, input::T2
-  )::Union{Tuple{String, Number, Number, Bool}, Tuple{String, Nothing, Number, Bool}} where {T1<:agent, T2<:AbstractString}
+function winestock(config::T1, input::T2
+  )::Union{Tuple{String, Number, Number, Bool}, Tuple{String, Nothing, Number, Bool}} where {T1<:AbstractDict, T2<:AbstractString}
   
   # SELECT *
   # FROM food
@@ -469,16 +469,16 @@ function winestock(a::T1, input::T2
     """
 
   pprint(prompt)
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
 
   # send formatted input to user using GeneralUtils.sendReceiveMqttMsg
   msgMeta = GeneralUtils.generate_msgMeta(
     externalService[:mqtttopic],
     senderName= "virtualWineUserChatbox",
-    senderId= a.id,
+    senderId= string(uuid4()),
     receiverName= "text2textinstruct",
-    mqttBroker= a.config[:mqttServerInfo][:broker],
-    mqttBrokerPort= a.config[:mqttServerInfo][:port],
+    mqttBroker= config[:mqttServerInfo][:broker],
+    mqttBrokerPort= config[:mqttServerInfo][:port],
     msgId = "dummyid" #CHANGE remove after testing finished
   )
 
@@ -505,7 +505,7 @@ function winestock(a::T1, input::T2
         }
       }
       """
-      responseJsonStr = jsoncorrection(a, _responseJsonStr, expectedJsonExample)
+      responseJsonStr = jsoncorrection(config, _responseJsonStr, expectedJsonExample)
       _responseDict = copy(JSON3.read(responseJsonStr)) 
       responseDict = _responseDict[:attributes]
       
@@ -559,8 +559,8 @@ function winestock(a::T1, input::T2
   # return result, nothing, 0, false
 end
 
-function wineattributes_wordToNumber(a::T1, input::T2
-  )::Dict where {T1<:agent, T2<:AbstractString}
+function wineattributes_wordToNumber(config::T1, input::T2
+  )::Dict where {T1<:AbstractDict, T2<:AbstractString}
   
   systemmsg =
   """
@@ -656,16 +656,16 @@ function wineattributes_wordToNumber(a::T1, input::T2
     """
 
   pprint(prompt)
-  externalService = a.config[:externalservice][:text2textinstruct]
+  externalService = config[:externalservice][:text2textinstruct]
 
   # send formatted input to user using GeneralUtils.sendReceiveMqttMsg
   msgMeta = GeneralUtils.generate_msgMeta(
     externalService[:mqtttopic],
     senderName= "wineattributes_wordToNumber",
-    senderId= a.id,
+    senderId= string(uuid4()),
     receiverName= "text2textinstruct",
-    mqttBroker= a.config[:mqttServerInfo][:broker],
-    mqttBrokerPort= a.config[:mqttServerInfo][:port],
+    mqttBroker= config[:mqttServerInfo][:broker],
+    mqttBrokerPort= config[:mqttServerInfo][:port],
   )
 
   outgoingMsg = Dict(
@@ -691,7 +691,7 @@ function wineattributes_wordToNumber(a::T1, input::T2
         }
       }
       """
-      responseJsonStr = jsoncorrection(a, _responseJsonStr, expectedJsonExample)
+      responseJsonStr = jsoncorrection(config, _responseJsonStr, expectedJsonExample)
       _responseDict = copy(JSON3.read(responseJsonStr)) 
       responseDict = _responseDict[:attributes]