Update app.py

app.py

@@ -80,4 +80,8 @@ def main():
         reply = st.text_input("What you want to say: (e.g., I am available after 2 PM.)", key="reply")
         if st.button("Generate the Reply"):
             result = chain.stream({"sender": sender, "subject": subject, "message": message, "reply": reply})
-            st.write(result)   
+            st.write(result)  
+
+
+if __name__ == '__main__':
+    main()