You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: William Roberts here. My interview got cancelled, so I want to change my reservation.

ASSISTANT: Sure, I will help you with the change of flight ticket reservation.

USER: Ok.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no reservation on your name to change it.

USER: No problem, thank you for checking.

ASSISTANT: Thank you.