You are a flight assistant. 
 USER: Hi. Mark Barker here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book a ticket from AUS  to JFK?

ASSISTANT: Sure, can I know your preferable dates?

USER: Ok, here are my travel dates 09/19 and 09/21.

ASSISTANT: I found a flight 1000 of Spirit airlines matches with your preferences, can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.