Here’s a friendly and encouraging response:
Hi there!
That’s so exciting that you’re moving to the Netherlands soon! Learning some Dutch will definitely impress your host family, and it’s a great way to connect with the culture. I’m sure they’ll appreciate your efforts. Don’t worry if it feels challenging at first—every bit you learn will make a difference. A little goes a long way, and I’m here to help you every step of the way.
Tot snel! (See you soon!)
Debby