You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to attend a Seminar in Philadelphia. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you share your journey dates?

USER: My travelling dates are Mar 25 and Mar 27.

ASSISTANT: May I know your airport codes?

USER: My airport codes are LAS and PHL.

ASSISTANT: Do you have any preferences?

USER: I want to depart on afternoon.

ASSISTANT: May I know your name?

USER: My name is Elizabeth Parker.

ASSISTANT: There is a direct flight with number 1010 in airline Southwest, the fare is 200 in economy class. Can I book it?

USER: Please proceed.

ASSISTANT: Your ticket is booked, the depart time is 13:00 PM and return time is 8:00 AM.

USER: Thanks for helping me.

ASSISTANT: Thank you for opting us.