You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend my friend's birthday party at Las Vegas, please help me in booking a ticket from DCA to LAS.

ASSISTANT: Sure, can you share your trip dates?

USER: My planned trip dates are on Jan 2 and Jan 4.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: My name is Robert Nelson.

ASSISTANT: There is a connecting flight with number 1024 in airline AA, the fare is 100 in economy class. Can I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is reserved, the depart time is 5:00 hours and return time is 4:00 hours.

USER: Thank you for your services.

ASSISTANT: Thank you for choosing us.