Olympic Airline Tickets

I'm about to buy a return ticket with Olympic Airlines and I want to know what happens if I cancel (before departure)? Also, if something happens, like the flight was delayed or canceled, no one knows what happens?

I would like a link to where it shows this on their website. I looked but found nothing of use in this sense. They closed at 8:40 I can not call them tomorrow, but I'm really looking forward to buy this ticket.

They will be the same as any other airline. If you buy a restricted ticket, you can not cancel without losing your money. They will change, but only for a fee. If you need the flexibility to be able to cancel, you will pay more for your ticket.