You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me to reserve a flight ticket from ATL to LAS?

ASSISTANT: Sure, I am glad to help you and can I know your journey dates?

USER: My travelling dates are 20 and 22 of Mar.

ASSISTANT: Is there any other specifications that has to be met for your journey?

USER: I prefer to travel in business class.

ASSISTANT: Can I know your name for proceeding further?

USER: I am Carolyn Garcia.

ASSISTANT: No flights found for this search to reserve a flight ticket for your journey on your travel dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: You are most welcome and thank you for consulting our agency.