You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need your help in booking a flight ticket to reach Las Vegas. Please help me out.

ASSISTANT: Sure, I am happy to help you. May I know your travel dates?

USER: June 22 and 24 are my planned travelling dates.

ASSISTANT: Please let me know your source and destination airport codes.

USER: ORD and LAS are the respective airport codes.

ASSISTANT: May I know your name?

USER: My name is Joseph Campbell.

ASSISTANT: Do you have any class preference?

USER: I am comfortable to fly in any class.

ASSISTANT: Ok, may I know your airline preference?

USER: You please check for a better airlines.

ASSISTANT: There is a flight with single connection available in Frontier airlines and the ticket fare is 200 only. Can I proceed for booking the ticket for you?

USER: Yes, I am happy with this offer. Please book the ticket.

ASSISTANT: Your ticket is booked in economy class and your flight number is 1005.

USER: Thanks for your service.

ASSISTANT: You are most welcome and thank you for choosing us.