You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please help me in booking a flight ticket from DCA to LAS?

ASSISTANT: Sure, I am willing to help you. Kindly mention your planned travelling dates to proceed further.

USER: Thank you. My travelling dates are Nov 03 and Nov 05.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a single connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I want to depart in the evening.

ASSISTANT: Thank you for providing your journey details, please wait a moment I'll search best flight for you.

USER: Sure.

ASSISTANT: Thank you for your time, Spirit Airlines is providing a connecting flight and the airfare is about 200 with flight 1021.

USER: Ok, proceed with the booking.

ASSISTANT:  On which name, do I need to reserve your ticket?

USER: My name is Raymond Jackson.

ASSISTANT: Sure, your ticket is booked in economy class.

USER: Thank you for the help.

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