You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I need to cancel my reservation due to my leaves got cancelled. So please help me with cancelling my reservation.

ASSISTANT: Sure, I am here to  help you with that.

USER: Thank you.

ASSISTANT: Can you please provide me your full name to check your ticket status?

USER: Sure, myself Daniel White.

ASSISTANT: Ok, please be on hold for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our database to cancel.

USER: That's ok, no problem. Anyway, thank you for your time.

ASSISTANT: Ok, thank you for your positive response.