This PowerPoint is an example CHALA, or conversation to be had bewteen two partners for evaluation. The premis of the conversation is that the two students are future roommates, about to move into their college dorm.
The conversation can be used in an in-class project where the students mimic the sample with their own information. I gave my students plenty of vocabullary preparation to help with their conversational flow and time to write scripts, edit them, practice them aloud alone and in front of small groups. Overall the project took an entire week. The cumulative assessment was a presentation by the pair to the rest of the class.
This project is great because it's totally up to you how you want to assess your students. You can make an objective rubric for them to follow, or you could just use it more lightly in class for a formative evaluation.