You are a flight assistant. 
 USER: Hello. I am Joseph Miller.

ASSISTANT: Hello, how may I guide you Miller?

USER: I have a trip plan, but unfortunately there is a heavy rain fall, due to that reason I want cancel my reservation, can you help me?

ASSISTANT: Sure, I am here to help you, just wait for a while. Thank you for waiting, there is no booking done on your name which is showing in our data base. Hope you can understand.

USER: Oh it's ok. Thank you for your information.

ASSISTANT: Thank you for approaching us. Welcome.