You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am having a little bit concern with the an economy class so I need a business class flight to Las Vegas in the month of May. Can you aid me in booking a flight ticket from New York?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for considering my request.

ASSISTANT: Please mention your source and destination airports codes?

USER: Ok, my source and destination airport codes are LGA and LAS.

ASSISTANT: Sure, may I know your name please?

USER: Ok, my name is Mark Lopez.

ASSISTANT: Sure, may I know your travelling dates please?

USER: Ok, my travelling dates are May 20 and May 22.

ASSISTANT: Sure, may I know your connection limit please?

USER: I need a connecting flight for my journey.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: Sorry Lopez, there is no flight found as per your travelling details.

USER: No a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.