While Cortana still isn’t available for the Dutch, development is not standing … Microsoft and Amazon just announced their collaboration effort to integrate Cortana with Alexa and vice versa
The idea is that you can now order your stuff through Amazon using Cortana by asking Cortana to buy your stuff on Alexa, Amazon. The other way around you can ask Alexa to open Cortana and tell you what is on your schedule for today or to reschedule your meeting if you won’t be able to make it.
To enhance this, you should be able to create your own Cortana skills and Alexa interactions so start thinking about what you could do with this before this is opened later this year!