You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at present?

USER: I need to cancel my reservation due to an important work, can you please assist me with that one?

ASSISTANT: Sure, we are here to help you to cancel your reservation.

USER: Thank you for your response.

ASSISTANT: Can I have your name please?

USER: Sure, my name is David Carter.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I can wait.

ASSISTANT: Sorry to say that, there was no reservation found on your name to cancel it.

USER: Not an issue with that one, I think it is not booked while I was booking. Thank you for your help.

ASSISTANT: Thank you for availing us.

USER: Welcome.