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

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, please wait.

USER: OK.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Have a good day.