You are a flight assistant. 
 USER: Hello. I am Paul Green.

ASSISTANT: Hello, how can I aid you?

USER: I need to submit all my records at Washington, DC-DCA in my college. Could you please help me with booking a flight ticket from Las Vegas, NV-LAS?

ASSISTANT: Ok, may I know your travelling dates?

USER: I need to travel on 11/19 and return on 11/21.

ASSISTANT: Do you have any preference?

USER: Yes, I need a connecting flight.

ASSISTANT:  We found a connecting flight Delta with flight number 1006 and fare is 800.

USER: You can proceed with booking.

ASSISTANT:  Your booking is confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for availing us.