You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: James Young here. I want to change my reservation due to heavy snowfall in JFK.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on you name.

USER: That's fine, thanks for your help.

ASSISTANT: You are welcome.