You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is William Green. I would like to cancel my reservation, could you help me out?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your details.

USER: Ok.

ASSISTANT: I have successfully cancelled your ticket.

USER: Thank you for your help.

ASSISTANT: Welcome.