and this is the e-mail I later sent to the artist:

Dear Dimitris

Bonjour. Please forgive my lack of being able to speak any other language than English, but in 2009 I attended L'estampe Contemporaine exhibition in Paris, and saw a work by you called 'Lamentation' (if I am remembering correctly). Since then, I have regretted not buying it.
I will be in Paris again, in June next year, and I was wondering if there would be an opportunity to rectify my mistake.
Will you be exhibiting in the 2014 estampe contemporaine? Or is there any way we could meet, perhaps through a gallery, or your agent, or in any way that is convenient for you?

regards
Mark Noke

and yes, he did reply.