You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Mark Adams here. Due to urgent work, I want to cancel my ticket.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you and have a nice day.