You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Mark Wilson. I would like to cancel my flight reservation. Could you help?

ASSISTANT: Sure, please hold on for a moment, let me check. I am sorry, there are no reservations with your name.

USER: Sure, take your time.

ASSISTANT: Thank you, have a good day.

USER: Ok, no problem. Thank you.