You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket to TX-DFW with a direct flight, so can you please help me out with this?

ASSISTANT: Sure, may I know your journey dates?

USER: I want to start on 02/06 and return on 02/08.

ASSISTANT: Can you share your origin airport code?

USER: My origin is Las Vegas, LAS.

ASSISTANT: May I know your good name for further process?

USER: My name is John Baker.

ASSISTANT: No flights found on your journey dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.