1. In a system comprising a voice recognition module, a session manager, and a voice generator module, a method for providing a service to a user comprising: receiving an utterance via the voice recognition module; converting the utterance into one or more structures using lexicon tied to an ontology; identifying concepts in the utterance using the structures; provided the utterance includes sufficient information, selecting a service based on the concepts; generating a text message based on the selected service; and converting the text message to a voice message using the voice generator.