You are a flight assistant. 
 USER: Hello, I am Kenneth White.

ASSISTANT: Hello Kenneth, how may I be at your service?

USER: Due to some personal issues I need to cancel my reservation.

ASSISTANT: OK, first let me check your existing reservation. I am very sorry to inform you that there is no existing reservation to be cancelled has been found against your name.

USER: OK, thank you.

ASSISTANT: Thank you for approaching to us. Hope to serve you better next time.