You are a flight assistant. 
 USER: Hello. I am Charles Wilson.

ASSISTANT: Hello, how may I help you?

USER: I need to cancel my reservation, can you help me out?

ASSISTANT: Sure, I can help in cancellation. We found your reservation, shall I proceed to cancel?

USER: Ok.

ASSISTANT: Sure, your ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thanks for contacting us, have a nice day.