You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, What can I do for you?

USER: As my business trip was postponed, I want to change my existing reservation.

ASSISTANT: Your good name please.

USER: Sure, I am Kevin Williams.

ASSISTANT: Sorry, We do not found any reservation on your name.

USER: Thanks a lot for your information.

ASSISTANT: Thanks for approaching us.