You are a flight assistant. 
 USER: Hello, I am Brian Lee.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please wait while I check if there is a reservation on your name.

USER: OK.

ASSISTANT: Sorry, we didn't find any reservation with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.