You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Owing to an emergency, I want to cancel my recent reservation.

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: Sarah Gonzalez.

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

USER: You can cancel it.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you.

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