Dear Shraddhaji,
To restrict a single patron to get books issued you need to de activate the patron. In this case patron would not be able to get books issued. To de-activate a patron go to admin-configure system-patron-search patron. locate the patron click the lock symbol given at top. by this you would be able to restrict a patron.
Dr. Pawan R. Agrawal
Assistant Librarian
Dr. APJ Abdul Kalam Government College
Govt. Arts, Commerce and Science College
Dokmardi- Silvassa
UT of Dadra and Nagar Haveli
396230