Yep, check out the Cyman Digital Butler for Android. With the paid version, when you get an incoming text you can set it so he reads out who sent it, then you can say "read message", or "reply" and then your reply. You can also initiate messages, and there are helpful features to help with complex names. Like if you said "my wife is called ...". You could then later say "send a text to my wife". I worked pretty hard on it!

If your asking if their's another service like Google voice, I'm not sure. I haven't done much more digging on text message bot integration, although you could make an irc bot which would operate on the same principle, just not through text, and not as private.

Not sure whether this will meet your need but i found voxeo[0] pretty good for voice related stuff. I had to discontinue my product idea due to the fact that they don't have instantaneous voice to text which was bummer for my project [0] www.voxeo.com