You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: As its business trip, please book a ticket to Philadelphia, PA-PHL from Washington DC-DCA.

ASSISTANT: Sure, could you please provide me your planned journey dates?

USER: My journey dates are from 02/15 to 02/17.

ASSISTANT: May I know your name please?

USER: My name is Ronald Williams.

ASSISTANT: We are glad to say that, we found a Spirit airline, flight number: 1002, price: 100 with one connection.

USER: Please book a ticket.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for choosing us.