You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Ronald Hill.

ASSISTANT: How may I assist you?

USER: Can you please book a flight ticket to Chicago, ORD as I am planning to meet my childhood friends after long time?

ASSISTANT: Please mention your travelling dates.

USER: I would like to board on 04/27. My return will be on 04/29.

ASSISTANT: May I know your origin airport code.

USER: Las Vegas, LAS is my boarding point.

ASSISTANT: Please provide connections limit.

USER: OK, there should be a lay by.

ASSISTANT: Sure. Ticket is found with airline Spirit having flight number 1000, price is 200. Shall I book a ticket?

USER: Yes, you can book this flight.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thanks.