After the eruption of Mount Vesuvius in 79, the ancient town of Pompeii was buried under the layers of volcanic ash and pumice and because of this numerous wall inscriptions which tell the story of the everyday life of inhabitants of the town were preserved. The abundance of graffiti indicates that a slightly larger portion of the population than what was previously thought was literate, and some graffiti were signed by women. In recent years, interest in the research of graffiti has grown again, but the approach to the material is changing and the graffiti are being studied in a broader context in order to collect more data. This thesis deals with graffiti from Pompeii in the form of dialogue, which can be between graffiti or involve the reader. For easier navigation, the graffiti are divided into greetings, arguments, comments, and graffiti where the authors address readers directly. Graffiti indicate the existence of differences between spoken and classical Latin. The authors address readers in a way that is understandable to them and because of this not every deviation from the standard, classical forms can be classified as a mistake.