You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Katherine Lee, want to cancel my reservation due to some personal problem.

ASSISTANT: Sure, please hold on for a moment, let me check.

USER: Ok.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: It's ok, thank you.

ASSISTANT: Thank you, have a good day.