Being Paired with Low Level Summoners

Squishyslime

When I do dungeons. I don't like wasting champs in dungeons. And as a Veteran player I know my basics around Units and Gold Consumption. But when I choose "Find A Partner," (Because my friends are busy) I sometimes get paired with a brand new player. I just want to know if Find a partner is random. Cuz if it is can you put a level cap on Dungeons?