I don't want eggs
She/he doesn't want eggs

what do you want? I want steak
what does he/she want? He/she wants steak

I don't have oranges
she/he doesn't have oranges

Do you have peaches?
Yes, I do
No, I don't

Do you like milk?
Yes, I do
No, I don't

Does she/he have bananas?
Yes, she/he does
No, she/he doesn't