how to: offer and ask for help

C- A party was a great idea, Júlia.
J- Yes, thanks. I'm looking forward to it.
C- Have we got everything?
J- Well, we've got enough drink, but there isn't much food.
C- Shall I get a cake and 3 packets of crisps or something like this? There's a shop near here.
J- Would you mind?
C- No, that's fine.
J- Thanks, Clàudia. Could you get 5 bars of chocolate too? And we need a few baloons.
C- OK, no problem. I'll see what they've got.