added changes

app.py

@@ -1,9 +1,11 @@
 import gradio as gr
+import random
 
-def echo(message,history):
-    return message
+def random_response(message,history):
+    response_options = ["yes", "no"]
+    return random.choice(response_options)
 
 
-chatbot = gr.ChatInterface(echo)
+chatbot = gr.ChatInterface(random_response)
 
 chatbot.launch()