You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Donna Rodriguez. I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please share your source and destination airport codes?

USER: My nearest source airport code is PHL and destination airport code is ORD.

ASSISTANT: May I know on what dates you have planned to travel?

USER: I would like to take off on 03/01 and return on 03/03.

ASSISTANT: There is a flight available on your requested dates from UA airlines with 2 connecting flights. Shall I proceed to book the ticket?

USER: Please proceed with the booking if the ticket fare is less than 200.

ASSISTANT: Your ticket is booked with flight 1012.

USER: Thank you for your service.

ASSISTANT: Thank you for flying with our service.