You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I need to cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, may I know your name?

USER: Kenneth Lee.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Please cancel reservation.

ASSISTANT: Your reservation has been cancelled.

USER: Thanks.

ASSISTANT: Thank you.