Query: user: I need to check out flights.
assistant: Where to? Also on what date and where are you travelling from?
user: I am leaving Chi-town flying to New York City today.
assistant: When will you be returning.
user: On 4th of March.
assistant: There are 3 possible flights for you. One is with American Airlines which flies out at 12:30 pm and returns at 3:40 pm, costing $132.
user: What are the other options? I will require 4 tickets.
assistant: There is a Delta Airlines flight that departs at 9:15 am and returns at 6 am. The cost is $137 per ticket.
user: What else is there?
assistant: There is a Southwest Airlines flight leaving at 9:50 pm and returning at 4:20 am, costing $136.
user: That suits me. Will you purchase the tickets and i prefer economy.

Intent: Flights:ReserveRoundtripFlights