Update app.py

Changed response to be yes or no

app.py

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