You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: Can you please help me to book a flight ticket from IAD to AUS?

ASSISTANT: Sure, can you please assign your journey dates that you wish to travel?

USER: My travelling dates are Dec 1 to Dec 3.

ASSISTANT: Do you prefer connecting or direct flight in your journey?

USER: I need a single connection of flight.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: May I know your name please?

USER: David Nelson.

ASSISTANT: Please let me know your other requirements.

USER: I don't have any other requirements.

ASSISTANT: There is a flight available with Spirit airlines, flight number 1005, and the fare of 100 in economy class. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been reserved with connecting flight.

USER: Thank you.

ASSISTANT: Thank you for choosing us.