You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Ok, may I know your name please?

USER: My name is Benjamin Collins.

ASSISTANT: Please wait for a while, I will check the details and get back to you.

USER: Sure.

ASSISTANT: Sorry Benjamin, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us, have a nice day. You are welcome.