I am trying to find out how to ask a manager about request I made to him a few days ago, and he said he would find out in x days, but x days has passed. He usually doesn't respond unless you ask him again and again.
As an example, asking him about buying a training course subscription for which he needs to get approval from CEO.
I normally start it by saying,
"Heya, Just thinking if you get a chance to ask CEO about...."
How do I remind him effectively?