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

ASSISTANT: Hello. How may I assist you?

USER: I want to meet my friend, can you please book me a ticket? It is a round trip from LAS.

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from 07/21 to 07/23.

ASSISTANT: Basis on your details, there is a flight with flight number 1003 with price is 200. Can I proceed?

USER: Yes, you can.

ASSISTANT: Your booking is done in Spirit airlines.

USER: Thanks for your service.

ASSISTANT: Most welcome.