You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Please help me to book a flight ticket from NY to visit Olympic National Park in DCA.

ASSISTANT: May I know your trip dates?

USER: Sure, I would like to depart on 10/15 and my return date will be on 10/17.

ASSISTANT: Can you please provide your take off airport code?

USER: I want to start from EWR.

ASSISTANT: Do you have any other requirements to be met?

USER: I need a connecting flight for this time.

ASSISTANT: Can I have your name please?

USER: I am William Brown.

ASSISTANT: UA airlines providing a connected flight in economy class.

USER: That's fine, you can book the ticket.

ASSISTANT: Your booking is done and 1021 is your flight number.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you.