You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine White..

ASSISTANT: How may I help you today?

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

ASSISTANT: I am happy to help you with that.

USER: Ok.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no reservation.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.