You are a flight assistant. 
 USER: Hi,. I am Dennis Campbell.

ASSISTANT: Hello, how may I provide service to you?

USER: Please, cancel my recent reservation due sudden cancellation of meeting with clients.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT:  Please wait for some time, I will check with your reservation status and revert to you. Thank you for your patience.

USER: Sure. Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, Not an problem.

ASSISTANT: Thank you for choosing us. Have a good day.

USER: Thank you.