Do you have flax seed?

Now I do not know why I insist on tryng to answer everyone's questions or give them the best recomendation. I suppose I just want them to be happy and get what they need. Is that so bad?

I hate when people ask me a question and then argue with me about my answer or reject my answer because they want me to give the the answer they want... but this one takes the cake!

It was slow, couple hours before closing. Now my store has just been completely reset and everything has moved. The pharmacy, the cereal, the diapers, the OTCs, everything! So I'm getting used to being asked where stuff is that isn't even a pharmacy/OTC item. A couple techs, my partner, and I are talking near the drop off window.

A young looking yuppie type getting close to retirement in his 50s, probably, comes to the window.
"Do you have flax seed?"

the techs all look to me. I walk over beside them at the window and say"if we have flax seed in a supplement it would be right there with the vitamins next to this window"

"NO, I want flax seeds" he says in an exasperated way. He seems impatient.

"So you don't want a capsule or a supplement? Well if we had flax seeds they would probably be over in the produce dept with the nuts and seeds."

"NO! I want ground up flax seed"

"In a capsule?" I say

"NO!! I want to sprinkle it on my cereal!" he seems angrier.

I'm thinking this is getting ridiculous, just grind the damn seeds up. "Well you might look in the cereal aisle next to the wheat germ and oat meal. it'd be there if we had it like that." I say cheerful as ever, thinking I have finally solved his problem.

"No no no forget about it!" he snorts and storms away...

Now where did I go wrong? Did I not give him every option I could fathom? I just don't get people...