flower dance 开头对白中文什么意思啊?

Woman: "They serve the purpose of changing hydrogen into breathable oxygen. And they’re as necessary here as the air is, on Earth.”
Man: "But I still say, they're flowers".
Woman: "If you like..."
Man: "Do you sell them?"
Woman: "I afraid not."
Man: "But, maybe we could make a deal?"
个人理解:
女:它们提供可以呼吸的氧气.在地球上,它们和空气一样重要.
男:但我任要说-它们是花.
女:随你
男:你会卖它们吗?
女:不.
男:也许我们可以做一笔交易.
我也没看出来这段对话有什么意义.