You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Could you please book a ticket from LAS to CLT.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Dec, 20 to Dec, 22.

ASSISTANT: Do you need a connecting flight?

USER: I would prefer connecting flight.

ASSISTANT: May I know your other preferences?

USER: I prefer to fly major airlines.

ASSISTANT: May I know your name?

USER: I am Ronald Davis.

ASSISTANT: We found a flight of United airline, flight number 1013 with the fare of 200.

USER: Please book a ticket.

ASSISTANT: Your ticket has been booked.

USER: Thanks.

ASSISTANT: Thank you for choosing us.