1. A method of classifying and ranking multimodal interpretations, comprising: generating a set of joint multimodal interpretations from a set of multimodal interpretations generated by one or more modalities during a turn; generating a set of integrated multimodal interpretations comprising an integrated multimodal interpretation formed from each joint multimodal interpretation by unifying type feature structures of each multimodal interpretation in the joint multimodal interpretation; and generating a multilevel confidence score for each integrated multimodal interpretation based on at least one of a context score, a content score, and a confidence score of the integrated multimodal interpretation.