Doran's suggestions look fine to me smile I think I'd leave the 'usted' out, but that's a matter of choice.

Note, Ann, that she's used the polite form. So, if you're going to go with it, you'll have to make sure the girl always uses the polite form when speaking. Otherwise, I (or someone else) could transfer these lines to the familiar form.

(Personally, I think that, if the girl is too little, she might use the familiar form even though Superman is an adult she doesn't know well... but I might be projecting from Greek. Anyways, polite should be okay.)

Also:
"When will you be back?" -- Cuando regresaras?

See ya,
AnnaBtG.

What we've got here is failure to communicate...