You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to book a flight ticket from ORD to AUS, please help me.

ASSISTANT: Sure, help me with the trip dates?

USER: February 17 and 19 are my planned travelling dates.

ASSISTANT: May I know your name please?

USER: Kevin Lee here.

ASSISTANT: Do you have any preferences?

USER: I would like to fly in a direct flight.

ASSISTANT: Sorry, no flights were running in your desired routes.

USER: Thank you.

ASSISTANT: Thank you for reaching us.