 Joseph Weizenbaum 's ELIZA could carry out conversations that were so realistic that users occasionally were <unk> into thinking they were communicating with a human being and not a program . But in fact , ELIZA had no idea what she was talking about . She simply gave a canned response or repeated back what was said to her , <unk> her response with a few grammar rules . ELIZA was the first <unk> . 
