1. A method comprising: collecting a plurality of audible utterances, via a plurality of industry specific spoken dialog systems, and during a plurality of collection phases comprising respective defined periods of time, to yield stored audible utterances; organizing, via a processor, the stored audible utterances into a plurality of datasets having call-type labels, wherein each dataset in the plurality of datasets pertains to a unique industrial sector in a plurality of industrial sectors, and wherein the each dataset for its respective unique industrial sector is independent of other datasets in the plurality of industrial sectors; generating an annotation guide comprising mnemonic names, textual descriptions, and both a positive example utterance and a negative example utterance for an associated call-type; and building a natural language spoken dialog system using the plurality of datasets and the annotation guide, wherein datasets having a call-type label associated with the negative example utterance of the annotation guide are not included in the natural language spoken dialog system.