I don't know if this is normal for a 4 1/2 year old, to do this but my 4 year does it. She says "I'm hungry". So I ask her what she wants and she says "I dunno". So I start asking her if she wants a sandwich, waffles, apple and carrots, pretty much anything we have in the kitchen except the damn kitchen sink. Everything I suggest she doesn't want. So I tell her, let me know when you figure it out. And she has a meltdown(she is spoiled).
Most of the time she wants something that is not appropriate for dinner, like a popsicle or a doughnut. Drives me crazy, because it happens everyday, all day!