You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight from DFW to attend a meeting at Las Vegas. Can you book a flight to LAS airport?

ASSISTANT: May I know your planned travel dates?

USER: I will travel on Sept 18 and return on Sept 20.

ASSISTANT: Sure, can you confirm your  destination airport code please?

USER: Sure, it is LAS.

ASSISTANT: Do you have any class preferences on your journey?

USER: I need a economy class flight ticket.

ASSISTANT: May I know your name for the booking process?

USER: My name is Rebecca Hall.

ASSISTANT: Do you have any another specifications?

USER: I need a connecting flight.

ASSISTANT: United Airlines providing a flight with the price 200 with single connection and it's in economy class only. Can I proceed for the booking.

USER: Please proceed with booking.

ASSISTANT: Your flight ticket reservation done with the flight number 1001.

USER: Thank you for helping me.

ASSISTANT: Welcome, thank you for reaching us.