Forgot to mention holiday during interview

I applied for Christmas casual role as a cashier so it’s only couple weeks, only problem is I forgot to mention a holiday I booked for New Year’s Day it’s from JAnuary 1 to the 2nd so only 2 days but they asked my availability and told them Mon-Wed and Friday. The interview went heaps good should I call them back and mention it to them holiday or would it make things awkward after a good interview

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