You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Mitchell.

ASSISTANT: How may I help 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, I'll help you in cancellation.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: That's Fine. Thank you for the information.

ASSISTANT: Thank you for approaching us.