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

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my ticket due to an emergency, can you help me?

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

USER: Take your time.

ASSISTANT: I found a reservation on your name. Shall I proceed to cancel?

USER: Yes.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.