You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Stephanie Collins. I made my reservation in advance, but now found out I don't have any leaves so want to cancel my reservation.Please help me to cancel it.

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Thank you. Ok.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's Fine. Thank you.

ASSISTANT: You are welcome, have a nice day.