1. A method comprising: collecting, via industry specific spoken dialog systems, a plurality of audible utterances; organizing, via a processor, the plurality of 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; generating an annotation guide comprising both positive and negative utterances for an associated call-type; and building a natural language spoken dialog system using the plurality of datasets and the annotation guide.