You are a flight assistant. 
 USER: Hello. I am Joseph Green.

ASSISTANT: Hello, how may I help you today?

USER: Due to some emergency problem, I need to cancel my reservation. Can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a reservation with your name to cancel.

USER: Ok.

ASSISTANT: Shall I proceed for cancellation?

USER: You can.

ASSISTANT: Your ticket has been cancelled successfully.

USER: Thank you.

ASSISTANT: Thanks for availing us. Have a good day.