You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Jonathan Miller.

ASSISTANT: Jonathan ,how can I assist you?

USER: Book a fight ticket from SFO to AUS. I prefer to travel from 06/22 to 06/24 dates.

ASSISTANT: Let me check, please wait for a moment. Flight number 1021 of Spirit airlines is available for you.

USER: Sure, please proceed the booking of the flight.

ASSISTANT: Your ticket is booked.

USER: Thank you so much.

ASSISTANT: Thank you for contacting us.