Find the third vertex of a triangle if its two vertices are $\left(-1, 4\right)$ and $\left(5, 2\right)$ and mid-point of one side is $\left(0, 3\right)$.

The mid-point of the line segment $AB$ shown in the adjoining diagram is $\left(4, -3\right)$. Write down the coordinates of $A$ and $B$.