tried the reponse prompt

app.py

@@ -86,7 +86,7 @@ with gr.Blocks() as demo:
     
 
         #get response from QA Chain
-        response = qa({'question': user_message, "chat_history": chat_history})
+        #response = qa({'question': user_message, "chat_history": chat_history})
         #append user message and respone to chat history
         chat_history.append((user_message, response["answer"]))
         return gr.update(value=""), chat_history