You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My trip to visit the White House has been cancelled for cancellation of my visa. So, I intend to cancel my reservation with the name of Mark Smith.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: No problem. Thank you for your kind information.

ASSISTANT: Thank you for opting us.