Read the following article and answer the question.

This is absolutely driving me nuts .- I wanted to take an intermediate photography course on the week day but the week day classes are full , only the one on Sat is available . Since I head out on the weekend this wo n't work . I toyed around with the idea of taking the basic one since I ' ve never had formal photography training .

Why does the narrator not take the class they wanted ?
They are not available on Saturday .