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

ASSISTANT: Hello, How may I address you?

USER: Due to an urgent work in office I want to cancel my recent reservation.

ASSISTANT: Ok, please give me moment I will check and revert you in a while.

USER: Ok.

ASSISTANT: Thank you for your patience. Sorry for the inconvenience we did not find any reservation on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for contacting us have a splendid day.