You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am  Frank Davis.

ASSISTANT: Do you want me to help you with anything?

USER: I want to change my reservation due to heavy rainfall in JFK.

ASSISTANT: Sure, I am Happy to help you. But, give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found on your name.

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

ASSISTANT: Thank you for contacting us.