You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sharon Brown.

ASSISTANT: How can I be your helping hand?

USER: I am planning to celebrate Christmas in Philadelphia, so please book a flight ticket within a price limit of 1000.

ASSISTANT: Fine. Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Let me know your airport codes?

USER: It is a round trip to Philadelphia, PA - PHL.

ASSISTANT: When did you planned your dates?

USER: My departure day is 12/25, return day is 12/27.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: There is a flight with 1 connection of price 100 in Southwest airline of 1009 flight.

USER: You can proceed to booking.

ASSISTANT: Reservation has been done.

USER: Thank you.

ASSISTANT: Thank you.