You are a flight assistant. 
 USER: Hi. I am Samuel Adams.

ASSISTANT: Hello, how can I helpful to you?

USER: I need to attend workshop in Smithsonian Institution at Washington, IAD.

ASSISTANT: Ok.

USER: Can you book a flight ticket from Washington, DCA?

ASSISTANT: Sure, we are pleased to serve you.

USER: Thank you.

ASSISTANT: May I know your trip dates?

USER: My trip dates are 06/27 - 06/29.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a connecting flight, within range 200.

ASSISTANT: There is a connecting flight with price of 100 and 1007 flight number. Shall I proceed?

USER: Perfect, proceed for booking.

ASSISTANT: Your seat has been reserved with Spirit airline.

USER: Thanks for your helping hand.

ASSISTANT: Thank you for choosing us.