You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you aid me in booking a flight ticket from LAS to ATL?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start on Oct 23rd and return back on Oct 25th.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer to travel in normal cost airline.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: I prefer to fly in direct flight.

ASSISTANT: May I know your name please?

USER: My name is Lisa Miller.

ASSISTANT: Sorry Lisa Miller, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.