Without knowing context, “if you so wish” is a formal and somewhat cold way to say: “If you want to” or “if you want it” “If you so wish” carries the strong feeling that the person who says it thinks it’s unwise to do whatever it is that is wished for. It means, “I think it’s a bad idea, but if you want it, I’ll do it because you’re the boss.”

What’s the first part of the dialogue that you would be responding to?