This looks like an interesting cloud-based platform.
http://www.zypr.net/pioneer-announces-availability-of-zypr-2/
It provides voice recognition, parsing, tts and other capabilities, with a focus on mobile apps and automotive applications but also available for free as web APIs. The business model is advertising based with rev share for the app developers.
The video on the site refers to “conversational” voice capabilities, but I haven’t looked into this in detail.