I am writing to let you know that we are closing the case file regarding _____ on which we represented you.  If you need further legal services, you should contact your local legal aid office.  You can find a list at Law Help http://www.lawhelpmn.org/MN/index.cfm.  

Any personal information we have of yours will be destroyed in by May 31, 2017. Enclosed is a client satisfaction letter. Please complete it and return it to us in the enclosed envelope.