\documentclass{letter}
\usepackage{hyperref}
\signature{Alvise Sommariva}
\address{Torre Archimede, room 427\\ Via Trieste 63\\ 35121 Padua\\ Italy}
\begin{document}
 
\begin{letter}{Prof. Dr. Annie Cuyt\\Universiteit Antwerpen\\
Department of Mathematics and Computer Science\\
Campus Middelheim, Building G\\
Middelheimlaan 1\\
B-2020 Antwerpen\\
Belgium}
\opening{Dear Professor}


I am writing to you on behalf of the Organizing Committee
of the {\it{3rd Dolomites Workshop on Constructive Approximation
and Application}}, that will be held in Alba di Canazei
(Trento, Italy), from September 9 to 14, 2012.

We are pleased to invite you to give a one-hour plenary talk at
the workshop and we would be honored if you will be able to accept.
With regard to expenses, we will be able to reimburse you up to an
amount of 900 Euros. For your information, we mention that the cost
of a nice hotel, including half pension (breakfast and dinner),
in Canazei during the period of the conference is typically about
70 Euros and we hope that the amount mentioned above is sufficient
to cover all, or at the very least, most of your expenses.

If indeed you are able to come, we would be grateful if you could
send us a preliminary title for your talk.

\closing{Best regards,}
 
\end{letter}
 
\end{document}
