Yes, it's actual dialogue, from the original series first-season episode Dagger of the Mind. The lady is the conveniently-named Dr. Helen Noel, played by the incomparable Marianna Hill.
One of the great things about Trek was that it recognized that despite all the tech they surround themselves with, people will be people. We'll still have Christmas, and office parties, and those little uncomfortable memories.
And that's something to smile about, wouldn't you say?
|What happens on the Enterprise stays on the Enterprise.|
And lest we forget the reason for the celebration, Trek's here to remind us: