We were told to invite a certain person by Lord Garon. Seeing you here, we wondered if you couldn’t help us out.
He means to ask him for help, right? Is it a typo? In Polish, though, you can easily phrase it like that.
Should it have been worded using a question tag instead?
we wondered if you could help us out, couldn't you
My mother language isn't English, and I'm not quite sure about some stuff.