You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, welcome to our agency. What kind of help you are looking from our agency?

USER: I am biology student, due to some research I want to visit National Zoological Park it is in Washington, can you please help me in flight ticket booking from Boston?

ASSISTANT: I can help you with that.

USER: Thanks.

ASSISTANT: Can I know the travel dates please?

USER: I want departure to Washington on 03/28 and please book my return ticket also 03/30.

ASSISTANT: Can you provide the airport codes please?

USER: I want to take off from BOS airport and destination airport is DCA, because these airports are very convenient for me to travel.

ASSISTANT: May I know your name for proceeding further?

USER: Sure, my name is Justin Thomas.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Justin, there is a flight with price 100 in Southwest airline. Can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been booked. Your return ticket has been booked with flight number 1014.

USER: Thank you for your help.

ASSISTANT: You are welcome.