There is no form letter for this type of request. Moreover, the request is not a legal one -- it's simply a letter "begging" corporate management to cut you some slack.
In my experience, sending a formal letter from a lawyer to try to obtain some "grace" from an employer would do more harm than good. What you need is to write the letter in your own words and tell management how the loss of severance will put you (and your children) on the street, etc.
Executives like to think that they are granting small benfits to the "little people" around them. It makes the executive think that he/she is a charitable person (while at the same time, realizing that the executive is the person who is terminating the employment of the person begging for help -- which, of course, makes the executive a supreme hypocrite).
BotXXXXX XXXXXne, write something yourself, and if you like, post the text here, and I will be happy to make some comments. But, I can tell you from experience, that the more desparate you make yourself seem in the letter, the better your shot of getting the severance granted.
Hope this helps.
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