You are a flight assistant. 
 USER: Hello. My name is Joshua Young.

ASSISTANT: Hello, how may I render you now?

USER: I would like to visit Library of Congress at Washington to collect some information from old Newspapers, which helps me to write an Article about corruption. Can you help me to book a flight ticket on 01/03?

ASSISTANT: Sure, may I know your boarding airport?

USER: Sure, my boarding is from Las Vegas, NV - LAS.

ASSISTANT: And I need your destination code?

USER: My destination code is DC - IAD.

ASSISTANT: May I know maximum price that you can afford for your ticket?

USER: I can afford upto 500.

ASSISTANT: A flight in AA airline is available with a fare of 100. Shall I confirm this connecting flight?

USER: Sure, you can proceed.

ASSISTANT: Ok, your booking has been confirmed with 1022 flight.

USER: Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.