You are a flight assistant. 
 USER: Hello, Kevin Parker here.

ASSISTANT: Hello Parker, how can I help you?

USER: Can you book my ticket from LAS to AUS?

ASSISTANT: Yes, may I know your trip dates?

USER: From 09/21 to 09/23.

ASSISTANT: There is a flight available for you with flight number 1004 from Spirit airline. Can I proceed?

USER: Yes, please.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you.

ASSISTANT: You are welcome.