A formal letter of dismissal needs to have the specific reasons for the dismissal. Be professional, but remember the recipient has feelings. Be tactful with examples of the offense that has led to the dismissal. Be straightforward, it doesn't have to lengthy. Don't make personal comments about the individual, and be sure to include follow up contact information. the recipient will more than
. likely have questions. More tips and ideas are at http://www.howtodothings.com/hobbies/a4596-how-to-write-a-dismissal.html.