A desk booking reminder email the day before the booking would be great, the option you brought out is not good enough, we don't want anything to be sent to calendars, we just want an email to go to the user who booked the desk the day before around 3pm so they can see if they still need the desk and if not free this up for others to book. 10am on the desk of the booking makes no sense as everyone will already be in the office therefore after this seat is free it is not seat in.