You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need to change my existing reservation because my singing competition has been postponed. Can you please change my reservation?

ASSISTANT: Sure, May I know your good name?

USER: Brenda Allen is my name.

ASSISTANT: No reservations were found with your specified name.

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

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