You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I be useful to you, at this moment?

USER: I am Rebecca Mitchell.

ASSISTANT: Ok.

USER: Aid me in booking a direct flight on 10/25 as I have to visit the Las Vegas , LAS being a tourist.

ASSISTANT: Sure, I am euphoric to help you.

USER: Ok.

ASSISTANT: Let me know, when will you catch your return flight?

USER: I will catch the return flight on 10/27.

ASSISTANT:  Ok, May I know your boarding airport?

USER: Boarding airport code is Atlanta, ATL.

ASSISTANT:  Please wait, let me search you the best flight.

USER: Sure.

ASSISTANT: Thanks for waiting, We could not process your request, as there are no direct flights for your journey.

USER: Ok, no problem.

ASSISTANT: Thanks for approaching us.

USER: Thank you for your help.