Update app.py

app.py

@@ -1,6 +1,13 @@
 import gradio as gr
+import random
 
 def echo(message, history):
     return(message)
-chatbot = gr.ChatInterface(echo)    
+    
+def yes_no(message,history):
+    responses = ["yes!", "no!"]
+    return random.choice(responses)
+    
+chatbot = gr.ChatInterface(yes_no, type="messages")    
+
 chatbot.launch()