You can visit a field office by making an appointment. The USCIS call center provides live assistance on the following toll-free number: 800-375-5283. (The online system called InfoPass is no longer available for those who are inside the U.S.)
If you need disability accommodation for your appointment (interview, biometrics, oath, etc.), the agency asks you to submit an e-request for it. Visit the following page to submit your request.
If you’re looking to reschedule your biometrics appointment, you no longer have to submit a written request as you can do so by calling the contact center at the above-mentioned number. However, you must provide a good reason and call before the date and time of the appointment, according to the USCIS.
The field office may have to temporarily closed= its operations because of bad weather or something unexpected. So, it’s always useful to check for the work hours of the office before your visit.