You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel King.

ASSISTANT: How can I assist you today?

USER: I want to join the brooklyn walking tour with my friend. Can you book me a ticket from ATL to IAD?

ASSISTANT: Sure, I can help you that. May I know your planned departure and return travel dates?

USER: I would start on Jan 31st and return on Feb 2nd.

ASSISTANT: Ok, do you have any other specifications?

USER: Yes, I need a cheaper flight with in price 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Frontier airlines is having a flight on that route with ticket fare of 100, shall I proceed for booking?

USER: Yes, please proceed.

ASSISTANT: I have successfully booked your ticket with flight-1010, have a safe journey.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.