You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I have got an invitation from White House, so I need you to book a ticket to DCA. can you help me out?

ASSISTANT: Sure, may I know your source airport?

USER: I would like to board from JFK.

ASSISTANT: Please share your planned journey dates.

USER: My preferable journey dates are 12/14 and 12/16.

ASSISTANT: May I know your good name please?

USER: I am Mary Nelson.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: I found a Delta airline, flight number: 1014, price: 100 with one connection.

USER: Please confirm it.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.