You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Margaret Wright.

ASSISTANT: Margaret Wright, What kind of service you are looking for?

USER: I am doing research on radar systems, so I need some books for my research purpose, I can buy the books from reading terminal market in Philadelphia, PA - PHL. Can you help me to book a flight under price of 500?

ASSISTANT: Sure, I want to know your departure and arrival dates. Can you provide them?

USER: I want to fly on 12/19 and 12/21.

ASSISTANT: Where do you want to start from?

USER: It is a round trip.

ASSISTANT: Ok, Please wait.

USER: Sure.

ASSISTANT: We have an Southwest airline, fare- 100, connections- 1 available for your journey.

USER: Please proceed with the booking.

ASSISTANT: Your ticket is confirmed with 1007 flight.

USER: Thanks for your kind service.

ASSISTANT: Thanks for choosing us, have a safe journey.