You may request a change of status to B-2 without leaving the country. You need to file Form I-539 with USCIS prior to the expiration of your current status. Read the instructions carefully when preparing the form. You can read more about changing status at http://myattorneyusa.com/change-of-nonimmigrant-status.
Answered on Sep 20th, 2016 at 3:41 AM