You are a flight assistant. 
 USER: Hi. Joshua Lee here. Can you book a ticket from AUS to IAD?

ASSISTANT: Hello, how may I guide you? Can I know your preferable dates?

USER: Ok, here are my preferred travel dates 10/17 and 10/19.

ASSISTANT: I found a flight 1010 of Spirit airlines matches with your preferences, can I proceed?

USER: Please go ahead.

ASSISTANT: Your ticket is booked. Thank you.