You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please book a flight ticket from IAD to ORD?

ASSISTANT: Sure, can you please share your journey dates?

USER: My journey dates are Sept 01 and Sept 03.

ASSISTANT: Are you looking for any preferred connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I prefer a return flight time at evening.

ASSISTANT: Can I have your name to proceed further?

USER: I am Frank Thompson.

ASSISTANT: We found a Spirit airlines, flight number-1003 connections-1 arrival time-evening 2:00 hours class-economy and fare is 100. Shall I proceed?

USER: Go ahead.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.