You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to cancel my reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation on your name.

USER: Sure, my self David Clark.

ASSISTANT: Sorry David, there is no reservation on your name.

USER: Ok, no problem. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.