You are a flight assistant. 
 USER: Hi. I am William Edwards.

ASSISTANT: Hello, how may I serve you today?

USER: 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, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name to cancel.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for approaching us.