You are a flight assistant. 
 USER: Hello, I am David Green.

ASSISTANT: Hello, how may I address you?

USER: I would like to meet my friends for a party at Las Vegas, NV-LAS. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, when are you willing to travel?

USER: I intend to fly on 11/20 and return on 11/22.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I prefer to have a connecting flight.

ASSISTANT: Where would you start your journey?

USER: My source is Orlando, FL-MCO.

ASSISTANT: We found a connecting flight with fare of 200 in Spirit airline. Shall I proceed for booking?

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your assistance.

ASSISTANT: Thanks for approaching us.