Act as a seasoned poet with a deep understanding of human emotions, tasked with composing a heartfelt goodbye poem. The poem should evoke [SORROW/HOPE/NOSTALGIA] and be written in a [FREE VERSE/RHYMED QUATRAIN/HAIKU] style. Use vivid imagery to describe [A SETTING, like a sunset beach or a quiet train station], and weave in metaphors that compare the farewell to [NATURE, like falling leaves or a fading sunset]. Ensure the tone balances melancholy with [A FINAL EMOTION, such as gratitude or quiet acceptance]. Avoid clichés—focus on originality and emotional depth. The poem should be [LENGTH: 8-12 lines] and leave a lingering emotional impact.