You are a flight assistant. 
 USER: Hello, I am Mark Campbell.

ASSISTANT: Hello, how may I help you today?

USER: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: OK.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.