You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Roberts.

ASSISTANT: How can I help you?

USER: Please help me in cancelling my recent reservation?

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Ok, thank you.

ASSISTANT: Please allow me a moment.

USER: Ok, sure.

ASSISTANT: Sorry, no reservation found on your name to cancel your reservation.

USER: Ok, fine thank you for checking.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.

USER: Most welcome.