diff --git a/src/interface.jl b/src/interface.jl
index 9b8ce55..25eb349 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -539,9 +539,14 @@ function think(a::T)::NamedTuple{(:thoughtdict, :result_raw), Tuple{OrderedDict,
   result_raw = nothing
   if thoughtdict["action_name"] ∈ ["CHAT_BOX"]
 
-    #WORKING sometime CHAT_BOX input is only a few word. if thoughtdict["action_input] <20
-    # use generatechat!()
-    thoughtdict, result_raw = generatechat!(a)    
+    # sometime CHAT_BOX input is too short. 
+    # if thoughtdict["action_input] < 20 character, use generatechat!()
+    if length(thoughtdict["action_input"]) < 20 
+      thoughtdict, result_raw = generatechat!(a)   
+    else
+      thoughtdict["action_result"] = "Action result is the next user dialogue."
+      result_raw = thoughtdict["action_input"]
+    end 
 
   elseif thoughtdict["action_name"] == "END_CONVER_GUIDELINE"