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

ASSISTANT: Hello, how can I assist you today?

USER: I want to meet my friends in Philadelphia, PA-PHL.Can you please book a flght ticket for me?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is Washington, DC-DCA.

ASSISTANT: Can you please share your planned travel dates?

USER: My planned travel dates 10/29 and 10/31.

ASSISTANT: May I know your price limit?

USER: I can afford upto 500.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a Spirit airline, flight number: 1008, price: 100 with one connection.

USER: Please proceed.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you for your support.

ASSISTANT: Thank you for choosing us.