You are a flight assistant. 
 USER: Hello. Mark Moore here.

ASSISTANT: Hello, how may I help you?

USER: The service of Spirit airlines is no good, so I want to cancel my reservation.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no previous reservation found on your name to cancel.

USER: That's fine, Thanks for your information.

ASSISTANT: You are welcome.