Singapore Airlines doesn't have a dedicated, walk-in office in Hamburg, Germany instead, they handle bookings and support through their Germany Contact Centre in Frankfurt, reachable at +1-866-829-1086 (English 24/7, German Mon-Fri 8am-6pm), or via email/their website for online services, directing you to Frankfurt for official contact. Jauntlet.comhttps://jauntlet.com/