Can I change the date on my ticket?
'Cambiare' — 'cam-BYA-re'. Three syllables; stress on the second.
Ask at the ticket office or online when your plans change and you need to travel on a different date from what is printed on your ticket.
'Cambiare la data' means to change the date. Italian train tickets have varying exchange/refund policies depending on the fare type ('Base', 'Economy', 'Super Economy'). Super Economy fares are typically non-changeable.
C'è una penale per il cambio?
Is there a fee for changing?
Asks about the change fee.
Il mio biglietto è cambiabile?
Is my ticket changeable?
Checks the fare type conditions.
Posso avere un rimborso?
Can I get a refund?
Asks about refund rather than change.
Trenitalia's ticket flexibility varies enormously. 'Base' fares allow changes free of charge up to departure. 'Super Economy' fares are completely non-refundable and non-changeable. Always read fare conditions before buying promotional tickets.