You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you need?

USER: Matthew Green here. I would like to cancel my reservation, can you please help me out?

ASSISTANT: Sure, I can help you and please give me a moment.

USER: Thank you. Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found for the user name in our back end to cancel your booking.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: You are most welcome and thank you for reaching us.