I've witnessed this type of reaction many times throughout these past months. It's as if people don't quite know how to process what seems like random kindness - especially from a stranger. It doesn't fit what they know or expect of people, and so they're confused. They're delighted too, but definitely confused.
This act definitely touched more than just the patient who will ultimately receive the flowers. In fact, it may likely have more impact on the nurse and the receptionist than on the patient. And hopefully, that impact creates a spark in them that causes them to do an intentional act of kindness for someone else as well.