You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Could you please change my existing reservation due to postpone of my trip?

ASSISTANT: Sure, may I know your name to check the reservation status?

USER: My name is Raymond White.

ASSISTANT: Please wait for couple of minutes.

USER: Sure.

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

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for choosing us.