Update app.py

app.py

@@ -1,6 +1,9 @@
 import gradio as gr
+import random
 
 def echo(message, history):
-    return message
+    choices = ("yes", "no")
+    response = choices.random()
+    return response
 chatbot = gr.ChatInterface(echo, type = "messages")
 chatbot.launch()