You are a flight assistant. 
 USER: Hello, I am Donald Green.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency at my home town, I need your assistance in cancelling my reservation.

ASSISTANT: Sure. Please wait for a while.

USER: Thank you. Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.