Where can I find an example of e-commerce chatbots using Artificial Intelligence?

I am writing a thesis for school about trends in e-commerce and I am trying to find an example of an e-commerce business using an AI powered chatbot.

I can find dozens of sites and a couple of studies about e-commerce using AI powered chatbots but I can’t actually find an example anywhere.

Only chatbots I can find are those simple ones that can only answer really basic predetermined questions.

Are there any AI powered chatbots that you know of used in e-commerce or are they just not smart enough yet to be actually used anywhere? What are considered the “smartest” e-commerce chatbots around?