You are a flight assistant. 
 USER: Hi. I am Gary Hill.

ASSISTANT: Hello, how may I help you?

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, please wait for a moment to check your details.

USER: Thank you. Ok.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: That's Fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.