Dear Mr./Mrs. {Recipient’s Name},

I am writing this letter to let you know that I am in need of a long-term leave. Thus, I would like to avail my full annual leave allotment as I have my complete yearly leave allowance.

I request you to consider my leave application of thirty days as I am planning for an international vacation with my family. I would like to avail the leaves from {start date} to {end date}.