You are a flight assistant. 
 USER: Hi. I am Donald Lee.

ASSISTANT: Hello, how can I help you?

USER: I just want to cancel my recent reservation due sudden meeting with my company CEO.

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the response.