You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Alexander Moore here.

ASSISTANT: How can I assist you?

USER: Can you please help me in booking the ticket from Dallas to Las Vegas?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I want to depart from here on 02/18 and return back by 02/20.

ASSISTANT: Could you please provide the airport codes?

USER: My airport codes are DFW and LAS.

ASSISTANT: There is a flight with price 100, can I book it?

USER: Yes, you can proceed for booking.

ASSISTANT: Your ticket has been booked with flight number 1015.

USER: Thank you so much for booking.

ASSISTANT: Thank you for approaching us.