Here's an interesting resource from Alzheimers Australia.
Is it dementia? is a collection of video scenarios from seven sectors including transport, retail, banking and emergency services. Each presents several case studies, showing how people affected by dementia might react to certain situations and what might help. In the transport section a lost ticket or a seemingly 'tricky', forgetful customer is handled with consideration, encouraging us to think about those situations we've witnessed ourselves.
A useful reminder of the invisible nature of dementia, particularly in busy, everyday situations.