Update app.py

app.py

@@ -37,7 +37,6 @@ def respond(message, chat_history):
     model = ChatOpenAI(model='gpt-3.5-turbo')
     qa = ConversationalRetrievalChain.from_llm(model, retriever)
 
-    chat_history=[]
     bot_message = qa({"question": message, "chat_history": chat_history})
     chat_history.append((message, bot_message['answer']))
     time.sleep(1)