Draft a polite reply in Dutch to ask for a different appointment date, then check what it says in English.
Understand it in your language. Take action in another.
Fictional example in Dutch
Goedendag, ik kan niet naar mijn afspraak op dinsdag 17 november komen. Zou het mogelijk zijn om de afspraak te verplaatsen naar donderdag 19 november? Alvast bedankt.
What it means in English
Hello, I cannot attend my appointment on Tuesday 17 November. Would it be possible to move it to Thursday 19 November? Thank you in advance. Thursday is a proposed date. Wait for confirmation before treating the appointment as changed.