You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I serve you?

USER: Please book a ticket from Washington DC-DCA to Austin, TX-AUS.

ASSISTANT: Sure, I can help you. May I know your name?

USER: My name is Kenneth Taylor.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from 02/10 to 02/12.

ASSISTANT: Do you need any break?

USER: I don't need any break.

ASSISTANT: Ok. We found a Spirit airline, flight number:1000 and the price is 200.

USER: Please book a flight.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks.