add requirements

app.py

@@ -1,9 +1,10 @@
+import random
 import gradio as gr
 
 
-def greet(name):
-    return "Hello " + name + "!!"
+def random_response(message, history):
+    return random.choice(["Yes", "No"])
 
 
-iface = gr.Interface(fn=greet, inputs="text", outputs="text")
+iface = gr.ChatInterface(random_response)
 iface.launch()