You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you out?

USER: I am planning to celebrate my birthday in Las Vegas, NV - LAS, so please help me in booking a flight ticket from Charlotte, NC - CLT.

ASSISTANT: Ok. I will help you for sure. Please send the travel dates.

USER: I want to fly on 07/27 and return on 07/29.

ASSISTANT: May I have your name?

USER: I am Lisa Clark.

ASSISTANT: Thanks for providing your name. If you are comfortable to travel with Spirit airline, I will proceed to book. Shall I continue?

USER: You can proceed to booking.

ASSISTANT: Your reservation is done.

USER: Thank you.

ASSISTANT: Thank you.