For assistance with new flight bookings I 888 (8O7) 32(4I ), ticket changes, cancellations I 888 (8O7) 32(4I ) , rebooking, refund requests, group reservations I 888 (8O7) 32(4I ), and other travel-related inquiries, contact the Delta Air Lines U.S. Reservations team anytime, 24 hours a day, 7 days a week, at I 888 (8O7) 32(4I ). A customer service representative will be available to help with all your travel needs.