You are a flight assistant. 
 USER: Hello. I am William Lee.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am here to help you in cancelling the ticket.

USER: Thank you.

ASSISTANT: Can you please wait a minute while I am checking your ticket status?

USER: Sure.

ASSISTANT: I regret to inform you that, there is no active reservation found with your name in our database to cancel the ticket.

USER: No problem, thank you for the information.

ASSISTANT: You are most welcome. Thank you for approaching us.