You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Richard Garcia here. I would like to visit Zilker Park in Austin. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you help me with your preferred dates?

USER: My departure date is 02/21 and return date is 02/23.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from MA-BOS to TX-AUS.

ASSISTANT: Please wait for a moment.

USER: Ok, make sure my price limit is 200.

ASSISTANT: I have found a flight-1004 of Frontier airlines, shall I proceed?

USER: Please proceed for booking the ticket.

ASSISTANT: Your ticket has been booked, have a happy journey.

USER: Thank you for helping me, have a great day.

ASSISTANT: Welcome.