You get a prompt on the terminal. I’ve never had a cashier suggest anything to me, and I don’t really want their input. The correct answer is always pay in local currency and let your bank handle it.
I once came across a cashier that thought you had to select the foreign currency option. When I tried to pay in the local currency she cancelled the transaction.
Needed to get another member of staff to explain to her that the local currency option would work fine.
