You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on whose name the ticket has been reserved formerly?

USER: My name is Donna Evans.

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

USER: Ok, proceed to cancel my reservation.

ASSISTANT: Your ticket has been successfully cancelled.

USER: Thank you for your help.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.