You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Donald Thompson, I need to cancel my reservation.

ASSISTANT: Sure, I will help you in cancelling the reservation.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, anyway thank you for the help.

ASSISTANT: Thank you for reaching us.