You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I best serve you for the day?

USER: Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, may I know your good name?

USER: Myself Karen Roberts.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is a reservation found. Shall I proceed with cancellation?

USER: Yes, please.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you.