Dear Mr. Chris,
Regarding your request for Annual Leave beginning of Dec 13, I have a request to make and your co-operation is much appreciated.
As you know, our schedule is very tight at the end of the year and we need you around for a little while longer before you go on leave. I can grant you leave only beginning 20 December, which is 7 days after your indicated date. You can still take 14 days off and the extra 7 days in January will not be counted in next years annual leave.
I wish you a merry Christmas and a happy New Year. Thank you.