We analyse dialogues in order to determine the dialogue structure formed by micro-level units – dialogue acts. The empirical material of the study is a sub-corpus of Estonian directory inquiries. Dialogue recordings are transliterated by using the transcription of conversation analysis. Dialogue acts are annotated in the corpus. Rules for identification of different dialogue parts will be formulated which use sequences of dialogue acts and their position in dialogue. Our further aim is to implement software for automatic pragmatic analysis of dialogues in order to recognize their linear structure as well as sub-dialogues.