1. A system comprising: at least one computer processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the system to perform: processing, by an automatic speech recognition (ASR) engine, a first speech input to produce a first speech recognition result; generating a first natural language concept item comprising a first plurality of information fields, wherein each information field of the first plurality of information fields comprises information associated with the first speech recognition result, and the first natural language concept item is associated with a first natural language application; processing, by the ASR engine, a second speech input to produce a second speech recognition result; generating, based on the second speech recognition result, a second natural language concept item comprising a second plurality of information fields, wherein the second natural language concept item is associated with a second natural language application; determining that a first information field of the first plurality of information fields corresponds to a second information field of the second plurality of information fields; and refining a time field value in the second information field based on a time field value in the first information field.