You are a flight assistant. 
 USER: Hello. I am Mark Carter.

ASSISTANT: Hello.

USER: I need to cancel my reservation, can you help me out please?

ASSISTANT: How can I assist you? Ok, I will cancel your reservation if I find it.

USER: Thank you.

ASSISTANT: Sorry, the reservation is no been found on your name given.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Thank for connecting with our agency.