Really frustrating!
I was volunteering at vax centre yesterday, all appointments.
Very busy as one vaccinator was off sick.
I was checking names off as people arrived among other duties.
The early appointments were boosters but late morning we had a couple of dozen 2nd doses booked in, and over half of them didn't turn up!
I assume that they a) forgot date of 2nd dose when they booked their 1st one 6 months before or b) had brought forward their 2nd dose and not cancelled the later appointment.
Yes, the booking system should be robust enough to avoid the latter option, but we know that it's working at full stretch.
Those slots could have been used by someone else.