Update app.py

app.py

@@ -152,7 +152,7 @@ def main(topic, level, learning_objective=None):
 
 def chat(user_input, context, level, learning_objective):
     response = generate_response(user_input, context, level, learning_objective)
-    return response
+    return [(user_input, response)]
 
 # Gradio Interface
 with gr.Blocks() as demo: