Actually I have two spare tickets, but I'll be looking for a bird to take along to Amsterdam. So if you really badly need to trade two tickets then that might also be an option.
ciao ! i have 2 FOS tickets for PARIS. I need 2 FOS AMSTERDAM ! We could exgange 1 FOS ANSTERDAM with 1 FOS PARIS. Let me know sa soon as possible. Lucia(and Daniela) from Italy