As interactive narratives, by definition, change according to theuser's choices (dynamic story), so do the dialogue utterances by thecharacters. Writing all possible utterances manually faces scalingproblems. This motivates the use of natural language generationtechniques. We present ExpReal, a surface realizer and templatinglanguage that allows authors of interactive narratives to write flex-ible and enriched templates while maintaining control over theiruse. Templates are automatically selected based on author-specifiedconditions relating to the world state (e.g. characters' emotions) orthe current task at hand. ExpReal has been developed to support atleast three languages (English, French and Dutch).