Southwest Airlines doesn't have a physical office in Perth, Australia, as they primarily focus on domestic US travel and some Caribbean/Mexico routes, not international long-haul to Australia for any bookings, issues, or contact in Australia, you'll need to use their online support, customer service phone lines (often US-based), or perhaps a local travel agent, as they don't operate out of Perth. Jauntlet.comhttps://jauntlet.com/