Noticed by chance the other day something that had made its way into my spam folder, it was an email from my dentist. It said, we are sorry Mr Heckaslike but we have had to cancel your appointment on 30 July. If you call us we will be happy to arrange another appointment for you.
The appointment was to have any additional work done that was excluded from treatment during my more recent appointment for urgent work only. I am not expecting the cancelled appointment of 3.5 months to be brought forward, I might be surprised but I very much doubt it.