Moisés, there are lots of them everywhere these days.
For example there are tons of "guias de conversação para viagens." and you also might want to see the "Fale a Coisa Certa Em Qualquer Situação - Ron Martinez".
The Speak Up Magazine have conversations and their transcripts, when you are at upper basic or pre/low intermediate levels onwards.
Last but not least, there are plenty of good sites out there, just to cite two of them: http://www.bbc.co.uk/worldservice/learningenglish/
And don´t forget to study at least a little bit of the English grammar, so it will give you some understanding as to vary those expressions (say, conjugation of verb tenses, words that varies in sense depending on context etc). Please don´t go just learning by route (okay it´s a beggining already, but one gets tired of it with time).
Good luck, and have a wonderful weekend.
Ah, if you don´t understand some part of my above answer, please come back and ask, we will explain it to you.