Whoever is lighting the Shabbat candles should light for all other people who will be eating dinner in that home. So a host/hostess where you will eat should have you in mind when he or she lights Shabbat candles.
However, it is customary for any married woman to light candles wherever she will eat. Unmarried women do not need to light their own candles (as long as the host/hostess has them in mind when lighting), but they are not prohibited from doing so.