1. An apparatus for an interactive dialog system, the apparatus comprising: a semantic content generation block configured to generate an output statement informationally responsive to a user dialog input; a classification block configured to select, based on at least one fact or profile input, an emotion type code to be imparted to the output statement, the emotion type code specifying one of a plurality of predetermined emotion types; and a text-to-speech block configured to generate speech corresponding to the output statement, the speech generated to have the predetermined emotion type specified by the emotion type code; wherein the at least one fact or profile input comprises a parameter derived from usage of a mobile communications device implementing the interactive dialog system, and wherein the at least one fact or profile input further comprises a digital assistant personality.