You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Due to postponement  of my Visa processing, I want to cancel my recent reservation.

ASSISTANT: Sure, may I know your name please?

USER: My name is Brandon Lee.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.