\documentclass[aspectratio=1610]{beamer}

\usepackage{lipsum}
\usepackage{beamer-reveal}

\numberwithin{page}{section}
\renewcommand{\thepage}{\thesection-\arabic{page}}

\begin{document}

\section{Section Title}

\begin{frame}{Boo}
    \lipsum[1]
\end{frame}

\begin{frame}{Ga}
    \lipsum[2]
\end{frame}

\section{Section Title}

\begin{frame}{Lu}
    \lipsum[3]
\end{frame}

\begin{frame}{Loo}
    \lipsum[4]
\end{frame}

\end{document}
