The issue of intonation, here, isn't a technical one. I did my third years' internship in a 3 people startup, lost in the middle of the french countryside. And we were working on a software that could generate complete weather bulletin for any european city (>50k inhabitants) or simply deliver a personalized voicemail (with names, dates, past purchases) like any human would do. In fact people were calling back the number we gave, asking for "jeremy", the bot. It was really good and it was less than 1k lines of python code (embedded in django).

So, if Amazon wanted it to be something more than a marketing fluff then could -probably- do something about it.