\documentclass[10pt,a4paper]{article}
\usepackage[paper=a4paper,width=15.5cm,height=20cm,top=3cm,left=3cm]{geometry}
\newcommand{\authorinfo}[3][]{\par\noindent\textbf{#2} (\texttt{#1})\par\noindent\textsf{#3}\\\medskip}
\newcommand{\talktitle}[2][]{\title{#2}\author{#1}\date{}\maketitle}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amssymb,amsthm,amsmath, amsfonts, mathtools,latexsym}

%%%%%  PLEASE, THIS TEMPLATE MUST HAVE TWO PAGES AT MOST  %%%%%%%%%%%%


\begin{document}

%Insert your name and the title of your talk here
\talktitle[N. Name]{Title of the talk}




% Fill the author information here and add more if necessary
\authorinfo[email@address.com]{First Author Name}{Institution}
%\authorinfo[email@address.com]{Second Author Name}{Institution}


\noindent\textbf{Abstract}. % Write your abstract here


\begin{thebibliography}{1}

\bibitem{cite1}
N. Name.
\newblock Title.
\newblock {\em Journal}, 1(1):100--220, 2018.

\end{thebibliography}


\end{document}