First, handle such requests with the utmost confidentiality. Information that a student does or does not have a disability for which accommodations must be made is not a part of public information. Every effort must be made to preserve the privacy of the student who needs accommodations and to treat the individual with the same dignity and courtesy accorded to all other students in the classroom. Requests for special help or announcements to solicit a volunteer to make copies of class notes should be made without identifying the student to be helped. Confidentiality requirements are dictated by federal and state law. 
Second, handle student requests as promptly as possible, and maintain your own file of the request document for future reference. Since the ADA is a civil rights law, you may be glad at some future date to be able to produce the documents handed to you, along with your notes regarding interactions with the student and accommodations made.