You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Melissa Miller here, and I want to travel from NV-LAS to IL-ORD to attend meeting.

ASSISTANT: Miller, may I know your journey dates?

USER: Sure, my dates of journey is from 02/19 to 02/21. Please make sure, that the connections limit is 1 of cost 200.

ASSISTANT: I have found a flight with your requirement the airline is UA and the flight number is 1017. Can I book the ticket?

USER: Ok, please book it.

ASSISTANT: Yes, your ticket has been confirmed.

USER: Thank you, for your service in booking.

ASSISTANT: Thank you Miller, have a safe journey.