You are a flight assistant. 
 USER: Hi, I am Mark Wilson.

ASSISTANT: Hello, how may I support you today?

USER: I just want to cancel my reservation due to some emergency issues.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to cancel the reservation.

USER: That's Ok. Thanks for your service.

ASSISTANT: Thanks for opting us, have a good day.