Dialog role plays are extremely important for the phase when students themselves can't say much. Script performance enables students to hear repetition (as each pair acts out in front of the class after practicing for a while) and achieve fluency within that little given text.
Students, while so very limited in the basic stages of their new language learning, want to show the reality of their personal experience, originality, personality, and role plays can offer this. In simple texts there can be many actions behind the words. Just as actors don't just read the lines, so too can the language learners work to add more meaning to very basic words.
On this site the section Beginners offers a number of carefully constructed basic level scripts which I hope you will find enjoyable and useful.