You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Thomas Hall. I want to attend alumni at New York, NY-LGA on 03/20. Will you help me with booking a flight ticket?

ASSISTANT: Sure, please provide me your source airport code,departure date.

USER: Sure, My source is Washington DC-DCA, and return on 03/22.

ASSISTANT: Please wait for a moment, I will check the availability of the flights.

USER: OK,.

ASSISTANT: Thanks for waiting, I found a flight with your given details. The flight number is: 1017, airline: Delta, price: 200.

USER: It is perfect for me you can reserve a ticket on flight number 1017.

ASSISTANT: OK, your flight ticket has been confirmed.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.