Mike: I kinda forgot to sign up for Thursday morning classes 
Caroline: You don't need too
Mike: wtf? how come?
Hannah: they do that for us, Dean's office
Mike: That's new. Know why?
Hannah: There's just 12 of us now, it's just easier for them to make us a ready made plan
Mike: That's cool, nothing to worry about 
Caroline: Yeah, and no choice, there is too little of us, they're just gonna sign us up for those classes that are left with places
Dean's office is going to sign Mike up for classes. It is more convenient for the office as the group is only 12 students.