Avoid buying any flight *******@bookingcom at all costs. Especially their flexi ticket which they don't support and is a literal scam!
We tried to get a flight change for 5 days, eight calls, the flight times came and went, while they promised to call back in 3 hrs every time. Never a call came!
Left stranded overseas, our only option was to buy a completely new ticket direct from an airline company.
To top it off, their online complaints form is broken on both chrome and edge.