Update app.py

app.py

@@ -1,8 +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)
+
+print("Hello World!")
+
+chatbot = gr.ChatInterface(yes_no, type="messages")
 chatbot.launch()