-나요 asks politely and gently, leaving the other person room to hedge or decline: 해 본 적이 있는 사람이 있나요, 여기서? 'is there anyone here who's tried it?' It is softer than -습니까 and common when addressing viewers or guests. It pairs with action verbs and 있다/없다; for describing words the matching form is -은가요.