Not before, no. That would be rude.

[And clearly, being rude to ghosts is not something she could do.]

Typically, if you help a ghost, they might be inclined to help you in return. You can fight them of course, if you know how, but that's rarely productive unless they're aggressive or actively bothering mortals.

So let's see if we can help her, shall we?

[A small smile, and he's once away walking towards the ghost, fearlessly.]

Hi. I heard you were looking for someone? Can I help you look?