Leave for sister marriage

please make corrections in my letter

Dear sir,

I would like to inform you that my sister is getting married on 03-06-2010 ,As I am only son in my family, my parents need my help, most of the work related to marriage has to be completed by me, and my presence is necessary ,my earlier date of return is 04-06-2010 but I request you to send me back to home 29-05-2010(Saturday ) I assure you that I will complete all the responsibilities in OJT(on job training)

Thank you very much, and I will appreciate your consideration of my request during this most happy time of my life