This paper intends to describe the structures of opening, closing and maintenance in Portuguese conversation held by native Spanish speakers learning Portuguese as a second language in situations of greetings, farewells and maintenance of dialogued interaction with their underlying socio-interactional aspects. With that aim in view, the theoretical foundation of this work focuses on the concepts of sociolinguistics in connection with conversation analysis and pragmatic-based functionalism. The analyzed data originated from an audio recording corpus of three dialogued situations including two groups of informants: native Brazilian Portuguese speakers and native Spanish speakers learning Portuguese as a second language. By means of this analysis, this paper seeks to compare the rituals of greetings, farewells and maintenance of conversation that native Spanish speakers do with those performed by Brazilians in the same situational context, taking into account cultural and interactional data. The results show that interferences of the Spanish language at the level of linguistic structures tend to decrease more rapidly than at the socio-interactional level. Therefore, this research proposes instruments to cause native Spanish speakers learning Portuguese to effectively use those structures in the target language naturally without either literal translation or inferences of subjective Spanish culture.