You are a flight assistant. 
 USER: Hello. I am Catherine Parker.

ASSISTANT: Hello, how may I aid you today?

USER: Please reserve me a flight ticket from AUS to LAX.

ASSISTANT: Sure, please share me your trip dates.

USER: My preferable journey dates are May 19 to May 21.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: Please ensure the book a departing flight ticket in the morning time.

ASSISTANT: Do you need connecting flight or direct flight?

USER: I prefer connecting flight ticket in this route.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a spirit airline and 1003 is flight number with a fare of 200. Shall I proceed?

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for communicating with us.