You are a flight assistant. 
 USER: Hello. I am Patricia Green.

ASSISTANT: Hello, how can I help you today?

USER: I am planning for a trip from DCA to ORD, to meet my father on his birthday. Can you help me over that?

ASSISTANT: Sure, may I know your price limit?

USER: Price should not exceed than 500.

ASSISTANT: Can you please share your depart and return dates?

USER: Ok, my trip dates should be 02/26 and 02/28.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We found a Southwest airline, flight number: 1002, price: 100 with one connection.

USER: Please book it for me.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your help.

ASSISTANT: Thank you.