AI ChatBot ChatBox on website

I would like to install a AI ChatBot ChatBox on one of my (tame) adult websites. It will look like a customer service chat window, e.g. lower-right corner, but will be totally robotic script-driven, to interact with the web visitor and gather their comments about my products. I am looking for a ChatBot ChatBox where I can make up a handful of questions (like a typical "questionnaire"), but the AI will "discuss" the questions with the visitor, in sentence form, like a human Chat Box does. The visitor will type sentences, not click buttons, or rank on a scale of 1-10. Then save to some kind of file that can be parsed by script, and/or read in plain English. It should read/write English, German, Spanish, Mandarin. I am looking for someone who has done this before, with very little start-up time or learning curve. I have a small budget, because I am trying several things to modernize my sites. It should be a script that runs on my webserver, but could be a subscription product that runs on a commercial product's home server. You could prototype this, and sell to thousands of sites. Zen says they don't have one- after waiting 2 weeks for a response. Other companies don't either. At least Google can't find such.