You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Andrew Mitchell.

ASSISTANT: How may I guide you?

USER: I want to cancel my reservation due to personal problems.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, I could not find any reservation.

USER: That's ok. Thank you.

ASSISTANT: Thank you, have a good day.