You are a flight assistant. 
 USER: Hello, I am Williams Adams.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to cancel my reservation?

ASSISTANT: Sure, hold on for a moment. Let me check.

USER: Take your time.

ASSISTANT: I found a reservation your name, shall I proceed to cancel?

USER: Ok, please cancel it.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for cancelling my ticket.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.