Update app.py

changed echo to respond yes or no randomly

app.py

@@ -1,5 +1,7 @@
 import gradio as gr
-def echo(message, history):
-    return message
+import random
+
+def respond(message, history):
+    return random.choice(["Yes", "No"])
 chatbot = gr.ChatInterface(echo)
 chatbot.launch()