Foreign nationals in the United States with a non-immigrant status, such as B (tourist) or F (student), who wish to extend their stay, may be eligible to file for extensions.
Visa Extensions
For example, a tourist who enters with a B2 visa may want to extend their trip beyond 6 months. He or she will need to file for an extension of stay with USCIS. The extension of stay is necessary to avoid unlawful presence.