Please can you check my composition. thanks everybody

Dear Frank, I am writing in order to ask you to give me a permission to have some time off my work . The reason why I need it is my intention to get married. You should have meet my fiancée when we had a party at last Christmas. We at long last decided to knot the ties. So our wedding in January and we wanted our wedding to be the most memorable day in our life. It happed that we have to do many preparations and have so little time. That's why I would be very grateful to you if I were given time off since December,12 till December ,23. While I am absent I think our new coworker would be suitable in order to carry out my job. It is David. I found him very suitable as he is very diligent and hardworking. Moreover, he has had several training with me I have already asked his opinion about replacing me and he found it very challenging and fruitful for his career. If you do not mind David working temporary instead of me then since the Monday I will give him addition training in order to brush up his knowledge and am going to explain him in great details aspects of working with western clients. Besides it I am going to control progress of work every day through the internet. I will be back to work on December, 24 and I will try to finish all preparation quickly. And my future wife and I hope to see you and your wife at our wedding party. I am looking for your reply, Yours sincerely, Peter