You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Phillips here.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation, due to heavy rainfall in New York.

ASSISTANT: Sure, wait a moment please.

USER: Ok.

ASSISTANT: Sorry Paul, there is a no reservation found on your name in our database.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.