“Na“ can mean “please” (Berachos 9a). Yaakov said “please” to his father (Bereishis 27:19) but Esav did not (Bereishis 27:31). Why did Esav say “please” to Yaakov  (Bereishis 25:30)? Na can mean “raw” or “half-cooked” (Shemos 12:9). From Hallel: (Please) Save us Hashem (although we are not complete/fully repentant).