Singapore Airlines doesn't have a walk-in office in Hamburg their primary German contact is in Frankfurt for bookings, KrisFlyer, and general support, reachable via +1-866-829-1086 (English 24/7, German weekdays) or DACH_Reservations@singaporeair.com.sg. For airport services in Hamburg (check-in/baggage), you'd find them at Hamburg Airport (HAM), but for actual office support or changes, use the Frankfurt contact or their helpful online Help Centre. Jauntlet.comhttps://jauntlet.com/