diff --git a/src/interface.jl b/src/interface.jl
index e072f51..c080ca4 100755
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -14,7 +14,7 @@ using CommUtils
 # by setting the following variables, PythonCall will use system python or conda python and 
 # packages installed by system or conda
 # if these setting are not set (comment out), PythonCall will use its own python and package that
-# installed by CondaPkg
+# installed by CondaPkg (from env_preparation.jl)
 # ENV["JULIA_CONDAPKG_BACKEND"] = "Null"
 # systemPython = split(read(`which python`, String), "\n")[1]
 # ENV["JULIA_PYTHONCALL_EXE"] = systemPython # find python location with $> which python  ex. raw"/root/conda/bin/python"
@@ -32,8 +32,6 @@ using CommUtils
 
 #------------------------------------------------------------------------------------------------100
 
-
-#
 @kwdef mutable struct agent
     availableRole = ["system", "user", "assistant"]
     agentName::String = "assistant"
@@ -42,8 +40,6 @@ using CommUtils
     mqttClient::Union{mqttClient, Nothing} = nothing 
     msgMeta::Union{Dict, Nothing} = nothing 
 
-    context::String = "" # internal thinking area
-
     """ Dict(Role=> Content)  ;   Role can be system, user, assistant
       Example:
         messages=[
@@ -52,15 +48,17 @@ using CommUtils
               Dict(:role=>"user", :content=> "Hello, how are you"),
               ]
     """
-
-    # # Ref: Chat prompt format https://huggingface.co/TheBloke/Llama-2-7B-Chat-GGML/discussions/3
-    messages= [Dict(:role=>"system", :content=> "You are a helpful assistant.", :timestamp=> Dates.now()),]
+    # Ref: Chat prompt format https://huggingface.co/TheBloke/Llama-2-7B-Chat-GGML/discussions/3
+    # messages= [Dict(:role=>"system", :content=> "", :timestamp=> Dates.now()),]
+    messages = []
+    thougt::String = "" # internal thinking area
+    info::String = "" # additional info
 end
 
 function agent(
   agentName::String,
-  systemMessage::String,  # system message of an agent
   mqttClientSpec::NamedTuple;
+  systemMessage::String="You are a helpful assistant.",  # system message of an agent
   msgMeta::Dict=Dict(
     :msgPurpose=> "updateStatus",
     :from=> "chatbothub",       
@@ -76,36 +74,36 @@ function agent(
   availableRole::AbstractArray=["system", "user", "assistant"],
   maxUserMsg::Int=10,)
   
-  newAgent= agent()
-  newAgent.availableRole= availableRole
-  newAgent.maxUserMsg= maxUserMsg
-  systemMessage= "Your name is $agentName. " * systemMessage
-  newAgent.messages= [Dict(:role=>"system", :content=> systemMessage, :timestamp=> Dates.now()),]
-  newAgent.mqttClient= CommUtils.mqttClient(mqttClientSpec)
+  newAgent = agent()
+  newAgent.availableRole = availableRole
+  newAgent.maxUserMsg = maxUserMsg
+  systemMessage_ = "Your name is $agentName. " * systemMessage
+  push!(newAgent.messages, Dict(:role=>"system", :content=> systemMessage_, :timestamp=> Dates.now()))[,]
+  newAgent.mqttClient = CommUtils.mqttClient(mqttClientSpec)
   newAgent.msgMeta = msgMeta
 
   return newAgent
 end
 
-@kwdef mutable struct agentLangchain
-  availableRole=["system", "user", "assistant"]
-  maxUserMsg::Int= 10
-  llmAIRequestTopic_openblas = "llm/openblas/request"
-  llmAIRequestTopic_gpu = "llm/api/v0.0.1/gpu/request"
-  self_llmReceiveTopic = "chatbothub/llm/respond"
+# @kwdef mutable struct agentLangchain
+#   availableRole=["system", "user", "assistant"]
+#   maxUserMsg::Int= 10
+#   llmAIRequestTopic_openblas = "llm/openblas/request"
+#   llmAIRequestTopic_gpu = "llm/api/v0.0.1/gpu/request"
+#   self_llmReceiveTopic = "chatbothub/llm/respond"
 
-  """ Dict(Role=> Content)  ;   Role can be system, user, assistant
-    Example:
-      messages=[
-            Dict(:role=>"system", :content=> "You are a helpful assistant."),
-            Dict(:role=>"assistant", :content=> "How may I help you"),
-            Dict(:role=>"user", :content=> "Hello, how are you"),
-            ]
-  """
-  # Ref: https://huggingface.co/TheBloke/Llama-2-7B-Chat-GGML/discussions/3
-  # 
-  messages=[Dict(:role=>"system", :content=> "You are a helpful assistant.", :timestamp=> Dates.now()),]
-end
+#   """ Dict(Role=> Content)  ;   Role can be system, user, assistant
+#     Example:
+#       messages=[
+#             Dict(:role=>"system", :content=> "You are a helpful assistant."),
+#             Dict(:role=>"assistant", :content=> "How may I help you"),
+#             Dict(:role=>"user", :content=> "Hello, how are you"),
+#             ]
+#   """
+#   # Ref: https://huggingface.co/TheBloke/Llama-2-7B-Chat-GGML/discussions/3
+#   # 
+#   messages=[Dict(:role=>"system", :content=> "You are a helpful assistant.", :timestamp=> Dates.now()),]
+# end
 
 """ 
   add new message to agent
@@ -204,11 +202,19 @@ end
 
 
 function conversation(a::agent, usermsg::String)
+  addNewMessage(a, "user", usermsg)
   userIntent = identifyUserIntention(a, usermsg)
   @show userIntent
 
   #WORKING 1) add if-else user intention logic. 2) add recursive thinking
+  if userIntent == "chat"
+    generatePrompt_tokenPrefix(a, userToken="Q:", assistantToken="A:")
 
+  elseif userIntent == "task"  
+
+  else
+    error("user intent $userIntent not define $(@__LINE__)")
+  end
 end
 
 #TESTING
@@ -270,22 +276,60 @@ function identifyUserIntention(a::agent, usermsg::String)
 
   identify_usermsg = replace(identify_usermsg, "{input}" => usermsg)
 
+  result = sendPrompt(a, identify_usermsg, )
+
+  # msg = Dict(
+  #   :msgMeta=> a.msgMeta,
+  #   :txt=> identify_usermsg,
+  # )
+
+  # payloadChannel = Channel(1)
+
+  # # send prompt
+  # CommUtils.request(a.mqttClient, msg, pubtopic=a.mqttClient.pubtopic.llmAI)
+  # starttime = Dates.now()
+  # timeout = 10
+  # result = nothing
+
+  # while true
+  #   timepass = (Dates.now() - starttime).value / 1000.0
+  #   CommUtils.mqttRun(a.mqttClient, payloadChannel)
+  #   if isready(payloadChannel)
+  #     topic, payload = take!(payloadChannel)
+  #     if payload[:msgMeta][:repondToMsgId] == msg[:msgMeta][:msgId]
+  #       result = payload[:txt]
+  #       break
+  #     end
+  #   elseif timepass <= timeout
+  #     # skip, within waiting period 
+  #   elseif timepass > timeout
+  #     result = nothing
+  #     break
+  #   else
+  #     error("undefined condition $(@__LINE__)")
+  #   end
+  # end 
+  answer = result === nothing ? nothing : GeneralUtils.getStringBetweenCharacters(result, "{", "}")
+
+  return answer
+end
+
+function sendPrompt(a::agent, prompt::String; timeout::Int=10)
+  a.msgMeta[:msgId] = "$(uuid4())"
   msg = Dict(
     :msgMeta=> a.msgMeta,
-    :txt=> identify_usermsg,
+    :txt=> prompt,
   )
-
   payloadChannel = Channel(1)
 
-  # send prompt
-  CommUtils.request(a.mqttClient, msg, pubtopic=a.mqttClient.pubtopic.llmAI)
+  #WORKING send prompt
+  CommUtils.request(a.mqttClient, msg) 
   starttime = Dates.now()
-  timeout = 10
   result = nothing
 
   while true
     timepass = (Dates.now() - starttime).value / 1000.0
-    CommUtils.mqttRun(a.mqttClient, payloadChannel)#BUG no msg received
+    CommUtils.mqttRun(a.mqttClient, payloadChannel)
     if isready(payloadChannel)
       topic, payload = take!(payloadChannel)
       if payload[:msgMeta][:repondToMsgId] == msg[:msgMeta][:msgId]
@@ -300,14 +344,8 @@ function identifyUserIntention(a::agent, usermsg::String)
     else
       error("undefined condition $(@__LINE__)")
     end
-  end 
-  answer = result === nothing ? nothing : GeneralUtils.getStringBetweenCharacters(result, "{", "}")
-
-  return answer
 end
 
-
-
 # function getStringBetweenCurlyBraces(s::AbstractString)
 #   m = match(r"\{(.+?)\}", s)
 #   m = m == "" ? "" : m.captures[1]