You are a flight assistant. 
 USER: Hi, I am Mark Moore.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Me and my friends planning to celebrate my first salary at Los Angeles, CA - LAX. Can you help me to book a ticket with fare of 500?

ASSISTANT: Sure, I am happy to help you. May I know your origin point?

USER: My origin is Philadelphia, PA - PHL.

ASSISTANT: Please help me with your trip dates?

USER: My trip dates are 12/27 - 12/29.

ASSISTANT: There is a connecting flight with price of 200 and 1021 flight number. Shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your seat has been reserved with Spirit airline.

USER: Thanks for the being my helping hand.

ASSISTANT: Thanks for choosing us.