I have been reading "The Complete Robot" by Issac Asimov and there is a particular short story called "True Love". That specific story has been roaming around in my head for sometime now. The story is something like this and I will be paraphrasing a lot and never pull direct quotes.

In the story a man was able to create a separate system from the overarching main system called "MULTIVAC" found in most of Issac Asimov's stories. The system our "protagonist" for the story created was connected to the MULTIVAC system's vast ocean of data. Meaning it had access to all internal data. While being separated from the MULTIVAC itself this made the "system" illegal and dangerous.

I am cutting it short: The "protagonist" of the story fed his "system" as much data about himself as possible and then told it to find a suitable and best candidate to be his wife. The system then found the perfect woman, got our protagonist arrested and introduced itself as the protagonist to the woman. Basically the system "stole the identity" of our protagonist. Fun.