Or maybe you could have a marker on the record that makes them exempt for X reason for those who are particularly vulnerable and they don't have to worry.
But for most people, there is no excuse. There will always be proof, in your sent emails, phone logs etc. We have this all the time at work with the 'magic postman'. They never get the appointment letter or the one after that asking them to make contact by X date if they still want a referral open but they ALWAYS get the one saying they've been discharged. You could argue it's a huge waste of resources chasing them up too. We actually have a messaging system that works exactly like WhatsApp we can see they have opened and read the message, but they'll swear blind they never got the message
In the private sector, say you're seeing a therapist, you don't show up, you get charged, no questions and you sign a contract when you start agreeing to that. Tough
tit.
It's a wider issue anyway really of personal responsibility. People have become too reliant on the NHS. They want a quick fix instead of making a harder lifestyle change. People would much rather take a pill than do the work that's actually going to help them. Look I'm an NHS veteran. I wish I could be more optimistic, but I see it day in, day out.
I really don't see any other way we can encourage people to think about personal responsibility or the way they use the NHS more other than starting to charities things either through insurance or paying outright for things.