You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to cancel my existing reservation which is under my name due to health issue.

ASSISTANT: Ok, can you I know your name please? As it is mandatory to know your name for cancellation.

USER: Sure, my name is Jacob White.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Sure, take your time.

ASSISTANT: I found a reservation on your name, shall I proceed to cancel this ticket?

USER: Yes, please cancel my reservation.

ASSISTANT: Your ticket has been cancelled.

USER: I appreciate your help, thank you.

ASSISTANT: Thank you for choosing us. Have a good day.

USER: You are welcome.