Can I change my ticket?
cam-BIA-re — stress on second syllable. 'Biglietto' is bi-GLIET-to.
When your plans change and you need to travel on a different train than originally booked.
'Posso cambiare' (can I change) + object is a direct request. Different ticket types have different change policies — 'Base' tickets can be changed without fee before departure, while 'Economy' and 'Super Economy' fares are usually non-changeable.
Posso prendere il treno delle 15 invece di quello delle 13?
Can I take the 15:00 train instead of the 13:00 one?
Specify what you want to change to
C'è una penale per il cambio?
Is there a fee for the change?
Fees vary by ticket type
Posso rimborsare il biglietto?
Can I get a refund on the ticket?
Refund policies differ from change policies
Trenitalia's fare system has five levels: Super Economy (non-changeable, non-refundable), Economy (non-changeable), Base (changeable once before departure), Business (fully flexible), and Executive. Italo (NTV) has a similar system. Always check the terms before booking — the cheapest fares offer no flexibility.