On shopping for oil

This I had decided. I was to stop and check my p.o.box, and if the telephone bill was there, then I would jump on a public conveyance and go to Commercial Mexicana, the supermarket where one can pay one's phone bill and shop for food all in one place. If no bill, then I would get a few things at Ley, the very Mexican market in the center of town.
No bill, so Ley it was.
One thing I needed was a bottle of cooking oil. The last I bought was Canola, and I really liked it so I was searching the narrow and cramped aisle for oils and such like, not finding the one I was looking for. But AHA, thought I, a young person is busy stocking the shelves; I shall ask him.
It went something like this:
me...excuse me, young man. Do you have Canola Oil ?
him...Canola?
me...yes, Canola, Canola Oil
him...Oil? Canola?
me...yes, like this oil, this is soy oil. I want Canola.
him...Soy ? Oil ?
me...it says right here on the label...SOY! but I want canola, do you have any ?
him...Ah, this is soy oil
me...I know, I would like Canola, please.
him...One moment. I will ask boss man.
Boss man arrives. He looks around importantly and I start again
me...Excuse me , do you have Canola Oil
Boss man...Uh, we have oil, uh, corn and.......soy and
me, exasperated...I know, but do you have Canola Oil ?
Boss man, busy studying the shelves, looks at me and asks....Oil?
me..Thanks you for your time, thank you
and depart sans oil of any kind.
But tomorrow is another day, and another try.