You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to cancel my recent reservation because my trip is changed to some other locations. Will you assist me in cancelling my ticket?

ASSISTANT: Sure, please give me a moment to check your details.

USER: Ok.

ASSISTANT: Meanwhile, may I know your name?

USER: My name is Stephen Green.

ASSISTANT: No reservation found on your name. Sorry for inconvenience.

USER: It's ok, I think the ticket is cancelled by my brother.

ASSISTANT: Ok.

USER: Anyway's thank you for checking.

ASSISTANT: Thank you for choosing us.