Update app.py

app.py

@@ -66,7 +66,7 @@ import gradio as gr
 def chat_with_ai(user_input, chat_history):
     if is_greeting(user_input):
         response = chat_engine.chat(user_input)
-        chat_history.append((user_input, greeting_response))
+        chat_history.append((user_input, response))
         return chat_history, ""
     response = chat_engine.chat(user_input)
     references = response.source_nodes