Artificial intelligence is a fundamental part of our life today. An example is the simulators integrated by intelligent virtual characters that serve as instructors in interactive environments where no matter the place and time, people can take a class and even train in a video game. These virtual agents require a corpus of phrases to have a dialogue similar to that of a human being. This article describes an investigation of the types of speech acts immersed in an interactive dialogue. They describe the most relevant characteristics for an educational environment, such as the type of phrase, the function it performs, its meaning, etc., thus discarding those that do not belong to this environment. The main objective is to develop a specific corpus of phrases for an intelligent virtual agent belonging to a serious game for learning purposes used as an interactive learning environment.