Many textbooks include sample dialogs, or you may write your own. They can be useful to break the ice with shy learners, but they are not truly communicative because no original language is produced. Use them to practice self-confidence or to illustrate a grammatical pattern. Make them more communicative by selectively choosing words or phrases which can be blanked out and requiring students to substitute their own ideas in the blanks. Beginners may need a list of options to choose from. Having learners memorize the dialogs can help them gain the confidence to try role plays.