You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: My interview has been postponed, I want to change my reservation.

ASSISTANT: Sure, may I know your good name?

USER: Sure, I am Michelle Collins.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for opting us.