You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am looking to book a flight ticket from LAS to DTW. Can you help me for that?

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

USER: My travelling dates are Nov 23 and Nov 25.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer to book a business class.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Make sure that my return flight should be in afternoon session.

ASSISTANT: Ok, may I know your name please?

USER: My name is Stephanie Harris.

ASSISTANT: Sorry Stephanie Harris, there are no flights available on your requested dates.

USER: That's ok, thank you for checking.

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

USER: Welcome.