You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: David Davis here.

ASSISTANT: How can I help you?

USER: I am looking for a flight ticket with economy class as my class preference. So can you book it for me?

ASSISTANT: Sure, may I know your travel dates?

USER: Yes, my travel dates are from Feb 19 to Feb 21.

ASSISTANT: May I know your airport codes?

USER: Yes, the airport codes are from AUS to JFK. Look for a single connecting flight.

ASSISTANT: Ok, flight-1013 is available in Spirit airlines with single connection and the flight fare is 300. Can I proceed?

USER: I am fine with the airlines and fare. You can book it.

ASSISTANT: Your booking is confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.