You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to book a ticket from DCA to LAS. Can you please help me out?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I would like to travel on Dec 18 and return back on Dec 20.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Can you please provide your name to proceed further?

USER: My name is Mark Thompson.

ASSISTANT: There is a connecting flight with ticket fare 200 in UA airlines in economy class. Is it ok for you?

USER: That's fine, please proceed the booking.

ASSISTANT: Your booking is confirmed with flight number 1019. Depart time is 7:00 hours and arrival time is 17:00 hours.

USER: Thank you for your information.

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