You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your good name?

USER: My singing auditions has been postponed. Please change my existing reservation.

ASSISTANT: Sure.

USER: I am Sharon Hill.

ASSISTANT: Please wait a moment I will check and let you know the information.

USER: Ok.

ASSISTANT: We found that there is no reservation found with your name.

USER: no, problem. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.