Dear Sir,
I am writing concerning the position of assistant office Manager that i am due to begin next monday.However a problem has arisen.As you know, I currently work for my uncle food packing business,and you will remember from my interview that i have gained valuable experience there.Unfortunately he has had to go into hospital forn an operation,leaving my aunt incharge of both the home and the business,she has asked me,as this is a particularly bussy time of year,to stay on and help her with the running of the office.
I realized this will be inconvinent to you, but very much hope that,given the circumstance.you would be prepaired to allow me to take up my position with you two weeks later than planed.
I would like to emphasise that i remain very keen to work with you,and that i will be ganing farther useful experience during this time.
I look forward to hearing from you.
Yours Sincerely.