\documentclass[a4paper]{article}

\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}

\begin{document}
\pagenumbering{gobble}

\Large
 \begin{center}
%Title of the talk
Sample \LaTeX\ abstract for talks\\ 

\hspace{10pt}

% Author names and affiliations
\large
Arthur Author$^1$, Cecilia CoAuthor$^2$ \\

\hspace{10pt}

\small  
$^1$First affiliation\\
arthur.author@correspondence.email.com\\
$^2$Second affiliation\\
cecilia.coauthor@correspondence.email.com

\end{center}

\hspace{10pt}

\normalsize
\begin{abstract}
This is a simple one-page abstract template. Please keep your abstract length at one page. The abstract should be in English. Please avoid to use self-created commands if possible. Send the tex and pdf versions as one zip file named {\tt surname\_paderborn\_2019.zip} via email to {\tt aklump@math.uni-paderborn.de}.
\par Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. 
\end{abstract}

\end{document}