You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I have already reserved my ticket, but right now I want to cancel that reservation.

ASSISTANT: Ok. But I did not found any reservations with your name. May I know your name?

USER: I am Mark Clark.

ASSISTANT: Clark, anything else to help you.

USER: Thank you for checking.

ASSISTANT: It's my pleasure Clark. Have a good day.