Dear Alok Kumar,
It is unfortunate that on the day you were to join a new company, your father passed away. RIP.
Since you could not join your new company, they have revoked the offer letter. Now you have asked for the draft of the letter to restore the offer letter. A learned member has guided you on how to write the letter. However, when a dispassionate view is taken of your post, or if it is analyzed critically, the following questions arise:
a) How did the death of your father take place? What were the signs of illness preceding the death? Was he admitted to the hospital? Was he admitted to the ICU? If he was hospitalized, did you communicate to your future company that owing to the hospitalization, there is a chance of missing the joining date?
b) What communication took place before and after the death of your father? How did you communicate?
c) Are you a Hindu? As per the Hindu religion, the "Asthi Visarjan" (immersion of the ashes of the dead) takes place on the second or third day. Thereafter, post-death rituals start again on the ninth or the tenth day.
d) Is the location of your new company and the place of the death of your father the same? If yes, then after the immersion of the ashes, for the five or six days in between, there was a chance of joining the future company. Yes, during the "Sutak" (mourning period), one is not supposed to take on a new project or start new work. However, considering the demanding lifestyle or the work challenges of the 21st century, at least you could have visited your new company and explained your unpleasant situation. Did you do that?
Final comments: "Niyati" (destiny) keeps on taking various tests of humans in various forms. Probably, this was the test of your equanimity. Whatever the circumstances may be, one needs to be communicative. Many companies empathize when one is mourning. However, in your case, why the company authorities revoked the offer letter is not understood. What was the cause of their anguish? Despite maintaining the constant flow of communication, if the offer letter is revoked, then it shows the company authorities' inability to share one's grief. If this is the case, then the revocation of the offer letter could be a boon in disguise, and there is no need to repent for it. Start searching for a new job vigorously.
Thanks,
Dinesh Divekar