You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I want to cancel my reservation as I am unwell, can you please help me?

ASSISTANT: Sure, May I know your name?

USER: I am David Miller.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: We have found a reservation on your name, Shall I cancel it?

USER: Yes.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you so much.

ASSISTANT: Thank you for opting us.