Hi--we will be in Greece the end of this month and have been frustrated with trying to make train reservations in advance: Athens to Thessaloniki, and then Thessaloniki to Koulata/Kulata (Bulgaria). Our Athens hotel won't make them, neither will the travel agency that they referred us to. The train website is impossible to navigate and make reservations in English. We are only spending 2 nights in Athens so have very limited time so were hoping to make the reservations in advance. Any advice? Thanks!