You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I abet you?

USER: I am Stephen Young.

ASSISTANT: Thank you for providing your good name.

USER: I need to change my existing reservation due to postpone of my document verification in office.

ASSISTANT: Ok.

USER: Can you please help me with that?

ASSISTANT: Sure, wait a while.

USER: Sure.

ASSISTANT: Thank you for your patience. No reservation found with your name.

USER: Ok, no issue.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your information.