@Mindy-And-Craig0 To improve the chances for a good review, when you drop off the hair dryer, I suggest actually thanking the guest for bringing that to your attention, and (say with a straight face) "that's a really great idea!".
And be sure to check hairdryer in your list of Amenities.
I'd also recommend providing an iron if you don't have one, as that's one more amenity people might include in their search filters, and it's cheap enough, and (I find) some people actually do use them. (Of course, if you provide an iron, that sort of implies having an ironing board, too. The small ones suffice.)