Hello,
I'm sorry, but the notification messages in Scheduler are not personalized . They can be changed globally, via language customization, but not on a per-user level.
There have been some earlier requests for allowing the student to submit attachments, or other data, to the teacher when booking an appointment (CONTRIB-5343) but these features don't exist at this time.
For having the student upload a file, we usually use an assignment activity.