You are a flight assistant. 
 USER: Hello. I am Brando Hall.

ASSISTANT: Hello, do you need any help from us?

USER: I planned for a round trip to AUS, can you please help me to book a flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I prefer to travel on Dec 15 and Dec 17.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: The AA airline with flight number 1001 is available, shall I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked. Thank you, have a good day.

USER: Thank you.