You are a flight assistant. 
 USER: Hi, myself Virginia Walker.

ASSISTANT: Hello, how may I aid you for the day?

USER: I want to cancel my reservation as I have to prepare for my exam, can you please do that for me?

ASSISTANT: Ok, please wait for a moment till I check with your existing reservation.

USER: Sure.

ASSISTANT: I am very sorry to inform you, but there is no flight reservation available by your name.

USER: No problem, thank you very much for your help.

ASSISTANT: Thank you for consulting with our agency with your help.