Delta Airlines Oslo Office For passengers flying with Delta Air Lines, the Oslo office offers committed customer care and assistance. The office, which located in the center of Oslo, provides help with reservations, tickets, flight modifications, and general questions. The friendly staff is available to help with any queries you may have concerning luggage policies, travel information, or cancellation assistance. Both travelers leaving Oslo and those in need of assistance for flights connecting through the city can easily get in touch with the office.