Rename tooltip names in ggplot2

I'm trying to rename the names which are shown in the tooltip in a qplot

By using aes it worked so far but then i got the problem, that the values are incorrect because i dont know how to read each correct coordinate points

g=qplot(dataset[1], dataset[2], data=dataset, aes(x,y)) + geom_point(aes(text=sprintf("Costs: %s<br>Count: <br>Last Name: ", dataset[4])))

See screenshot here: https://ibb.co/bCN4Sx