[Look, it's not his fault if his life is an endless string of "I'm surrounded by people who are far more powerful than I knew and I don't realise this until they're attacking me with stabby things fml".]
There's no need to ask for such a natural thing, ma'am. I would address you correctly, if I may? [If she is yet another royal who won't let him call her by title he officially loathes her.]