If you went into a bike shop, per mobile, the staff could be expected to try ringing round a few of their other stores to find out if they had any in stock. And there'd be someone in store who'd know which ones would be the best ones to try.
Nowadays it's down to you to find this out.
Smart phones are shoving the searching onto the customer, as the staff don't seem able to manage without access to a phone or tablet.
Thay could have done but there would be little or nothing in it for them as any profit on a single tyre would be miniscule I would think; and as a passing stranger they knew they'd probably never see me again. Most bike shops now only want to sell new bikes from what I see.
If I had been local and a potential new, regular customer, or wanting something that gave decent profit margins, I'm sure they would have bent over backwards to sort me out.