The purpose of this research is to check the suitability of dialogue sections of teaching materials in terms of the level of interaction between conversation participants. With this aim in view, research has revealed that concretely describing the conversation scene is the way to reflect real-world language. In the dialogues contained in Korean teaching materials, materializing contextual information regarding the dialogue scene, especially information regarding time, has been neglected. As the relationship between participants develops through time and space, it seems that specifying such information in teaching materials is useful for enhancing authenticity. Moreover, research has revealed that more concrete information about the speaker and listener leads to active interaction among conversation participants; it also influences completion of dialogues in teaching materials in the capacity of discourse structure. In particular, it seems that conversation completion stages are missing in a number of teaching materials, and certain topics cannot be comprehended completely because of uncertainties about setting and context (e.g., relationship between conversation participants).