Singapore Airlines (SIA) generally uses a central contact center for many services, but for Geneva, they operate through partners or have local representation, often directing you to their main website/contact page or local GSA (General Sales Agent) for booking changes or support, though direct office details in Geneva aren't prominent in search results, focusing more on online/phone support, with Zurich being a major Swiss hub. Jauntlet.comhttps://jauntlet.com/