Slight Change of Plan

We arrive at Pisa Centrale at 4:00pm with the intention of getting a train to Venice via Florence. I kindly allow Ali to approach the ticket salesman as this being the first train we're about to take in Italy, it required many complex questions in order to purchase the most economical ticket. For example, do we buy single journey tickets as we go or is it cheaper to buy a rail pass that allows us to travel freely around Italy for a certain price (if this type of ticket even exists). After being swiftly directed to the international office around the corner, we're kindly advised that it is in fact much cheaper to buy individual tickets as and when we need them. So we're now sitting on the train heading for Florence, our final destination instead of Venice. Why? Because the last train to Venezia from Firenze was 5 minutes ago. So new ETA for Venice: tomorrow afternoon (after some brief exploring in Florence)