You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Ok. Give me a moment.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.