You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Myself Gregory Moore. Due to some conference meeting, I am going to cancel my reservation. Can you please help me for this?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok, I will wait for your kind response.

ASSISTANT: I have found your reservation, shall I cancel it?

USER: Please proceed.

ASSISTANT: Your ticket has been cancelled successfully.

USER: Thank you very much for your service.

ASSISTANT: You are welcome, have a nice day.