Contact
Ask about dates, prices or anything else about the chalets.
The best way to ask about dates is to email Chrystèle directly.
Tell her which chalet you have in mind, the dates you're thinking of and how many of you there are, and she'll come back to you with prices and availability. If you're travelling with children or a dog, mention that too.
You can also book either chalet straight through Airbnb, though booking direct saves you both the booking fee.