You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: We planed a tour to New York but seeing weather condition, I want to change my existing reservation.

ASSISTANT: Sure, may I know your good name please?

USER: I am Patrick Roberts.

ASSISTANT: Wait a moment please. Sorry, there is no reservation found under your name.

USER: That's ok. Thank you for your great service.

ASSISTANT: Thank you for reaching us.