It's trained to say it doesn't have information to recent data, such as today's weather.
But for questions that aren't based on recent data, it should still be able to say "i don't know" or "that question doesn't make sense" in the case of Luke Skywalker's problem with tribbles for example.
Edit: I do realize we're criticizing a computer program for not understanding the difference between Star Trek and Star Wars. Strange world we live in.