Added function yes_or_no

app.py

@@ -1,8 +1,15 @@
 import gradio as gr
+import random
 
 def echo(message, history):
-    print("Hello, world!")
-    return message
+    print("Hello, world!")    
+    return response
 
-chatbot = gr.ChatInterface(echo, type='messages')
+def yes_or_no(message, history):
+    responses = ['yes', 'no']
+    print("message:", message)
+    print("history:", history)
+    return random.choice(response)
+
+chatbot = gr.ChatInterface(yes_or_no, type='messages')
 chatbot.launch()