You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Ryan Thomas, help me to book a flight on 12/10 and return ticket on 12/12.

ASSISTANT: Sure, I am happy to help you. May I know your airport codes please?

USER: My source point is TX-IAH and destination is NV-LAS.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: Let me check the best flight for you. I found a flight for you with Southwest airline and it costs you 100.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked with 1024 flight number.

USER: Thank you for helping me.

ASSISTANT: Welcome.