Let's say you're on holiday in the Netherlands and need to book a flight. You can't necessarily use the same websites you do at home, but can't get to a travel agent. Where you you go?
This site has a great list of local flight booking websites in 32 countries. It will tell you that in the Netherlands, GoedkoopsteVliegtarieven.com is the place to go, or Despegar if you're in Chile. You need never be stuck again!