You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Owing to an emergency, I need to cancel my existing reservation. Can you please cancel it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Melissa Green.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Please, cancel it.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.