When speaking to your new neighbor who just moved in and expresses their disappointment about not having a garden and their intention to sell and move, it's essential to be empathetic and understanding. Here's a considerate response:
"I can imagine how challenging it must be to realize that the apartment you bought doesn't have the garden you were hoping for. Moving can be a big decision, and finding the right place that suits your needs and preferences is essential for your happiness. If you do decide to sell and move, I wish you the best of luck in finding your dream home with a beautiful garden. Meanwhile, if there's anything I can do to help or if you need any advice about the area, please feel free to ask. We're here to support you during your time here, whether it's short-term or long-term. Welcome to the neighborhood, and I hope your future plans work out wonderfully!"