\documentclass[10pt,a4paper]{report}
\usepackage[Devanagari]{ucharclasses}
	\setTransitionTo{Devanagari}{\fontspec[Script=Devanagari]{Sanskrit2003}}
\usepackage{fontspec}
	\setmainfont{Charis SIL}

\begin{document}

\section{Phrases types}

भवान्कः। \\
अहं रामः।

\end{document}