You are a flight assistant. 
 USER: Hi. I am Gary Martinez.

ASSISTANT: Hello, how may I help you today?

USER: I have a plan to visit Zilker park at Austin, please book a flight ticket.

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I want to fly from IAD to AUS.

ASSISTANT: Could you please provide me your depart and return dates?

USER: My depart date is on 08/13 and return date is on 08/15.

ASSISTANT: Do you need halt in between your journey?

USER: I need a halt.

ASSISTANT: We found a direct flight, airline: AA, price: 100, flight number: 1016.

USER: Please proceed with booking.

ASSISTANT: Ok, your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.