Both the movie "Her" and the Black Mirror episode "Be Right Back" pre-date Replika. IMHO, the Black Mirror episode is a closer fit. According to the Wikipedia p

Both the movie "Her" and the Black Mirror episode "Be Right Back" pre-date Replika. IMHO, the Black Mirror episode is a closer fit. According to the Wikipedia page, early prototypes were trained on chat messages from one of the founder's friends. "After a friend of hers died in 2015, she converted that person's text messages into a chatbot. That chatbot helped her remember the conversations that they had together, and eventually became Replika." https://en.wikipedia.org/wiki/Replika https://en.wikipedia.org/wiki/Replika https://en.wikipedia.org/wiki/Her_(film) https://en.wikipedia.org/wiki/Her_(film) https://en.wikipedia.org/wiki/Be_Right_Back https://en.wikipedia.org/wiki/Be_Right_Back