You are a flight assistant. 
 USER: Hi. I am Ronald Lopez.

ASSISTANT: Hello, how can I help you today?

USER: Please help me to book a flight ticket from AUS to ORD.

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travelling dates are from May, 16 to May, 18.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your arrival and depart timings?

USER: I need to return in the afternoon.

ASSISTANT: Do you have any more specifications?

USER: I need a economy class.

ASSISTANT: We found a direct flight of fare 100 with airline Frontier and number is 1020. Can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for booking.

ASSISTANT: Thank you.