You can generate movies from built scene scenarios with FPSC via scripting characters behaviours.
You can have them interact as any game engine model does in any other program if you animate them, script them and and apply the correct speech sound files appropriately and have those animations and behaviors for their interacation controlledd by your scripts.
Not at all easy to do but then its not exactly that easy in any program. Some programs of course are designed more with this kind of thing in mind so the results could be both easier to achieve than with FPSC and have a more professional appearance. - If you have the skill and put in the effort needed.
But scene management can be done in FPSC and recorded as video with one of the capture facility programs available such as FRAPS or Camtasia.
"I am and forever will be your friend"