A system, computer-readable medium, and method for automatically determining a topic of a conversation and responding to the topic determination are provided. In the method, an active topic is defined as a first topic in response to execution of an application. The first topic includes first text defining a plurality of phrases, a probability of occurrence associated with each of the plurality of phrases, and a response associated with each of the plurality of phrases. Speech text recognized from a recorded audio signal is received. Recognition of the speech text is based at least partially on the probability of occurrence associated with each of the plurality of phrases of the first topic. A phrase of the plurality of phrases associated with the received speech text is identified. The response associated with the identified phrase is performed by the computing device. The response includes instructions defining an action triggered by occurrence of the received speech text, wherein the action includes defining the active topic as a second topic.