the nurse didn't ask for his ID, like "Did you carry your ID card?"
go back to re-trainning class.
It's not a legal requirement to carry ID in the UK, and asking someone for their ID isn't exactly commonplace unless you're a cop or carding someone for booze/ciggies. SOP in hospitals is just to ask the patient for their name etc. They get a LOT of morons, drunk and the like, that just want to ###### around, so it's really not surprising she didn't believe a name like Elvis Presley. I wouldn't either.