Shall we have your order confirmation today, as 22 to 25 April are Eastern holidays.
The way you wrote the sentence is in the form of a question.
Shall we have your order confirmation today, as 22 to 25 April are Eastern holidays?.
It could be written this way -
May we have your order confirmation today, as 22 to 25 April are Eastern holidays?
Did you mean "Eastern" or "Easter"?
In the US it would be written this way -
May we have your order confirmation today as April 22nd to the 25th are ___holidays ?"