For Michelle you have to start by doing the class you teach for both of them. Then you have to meet Michelle in Classroom 3, not 4 where she is shown. Keep meeting her until she comes to your place. For Scarlett, meet her in the Cafe on Saturday afternoon several times, you can also meet her on Sunday in the park. Do both of these until you get to 8 or 9, then she loses her phone in the classroom. Go to the classroom and find it. Then back to the class the next day to return it. Then she asks you about Sundays, and you can get her the rest of the way up.