You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Charles Wilson here. I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, please wait a moment.

USER: Thank you for considering my request.

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

USER: Ok, not a problem.

ASSISTANT: Thank you.

USER: Anyway, thank you for the information.