decline letter请修改

decline letter请修改
Dear Ms. XXX, I am very fortunate that you give me offer and I am truly appreciate the opportunity the work with you. unfortunately, now I must say sorry...that I have to decline the offer.due to my present job have not taken over to the suitable one till now.the boss talked to me many many times to stay...even today he persuaded me all day... After careful thought and with great reget that I have to say sorry to you...to be frank,I think I am not doing the right thing, just am doing the good thing,Sincerely hope my foolish decision will not hurt you...I believe you can understand and forgive me... I still want express again my deep gratefulness to your offer and warm welcome. I hope and am sure we will have opportunity to cooperate in the future. All best wished to you and
谢谢!