i send a mail to my client for approval of my leave.. the content of that mail is as follows " I would like to take leave from 'date' on the occassion of my sister's marriage, kindly do the need ful" but my superior scolded me y did u send like this.. so after approval of my client i want to write thanking letter and i have to mention sorry to ask holidays... how to write a letter pls help me it's very urgent