Real estate agent: Upon selling a home, the sellers are legally entitled to remove any items that are not permanent fixtures. Legally, large appliances like dishwashers are not permanent fixtures. However, since many prospective buyers of the home are likely to assume that large appliances in the home would be included with its purchase, sellers who will be keeping the appliances are morally obliged either to remove them before showing the home or to indicate in some other way that the appliances are not included.
If a home's sellers have indicated in some way that a large appliance is included with the home's purchase, then they are morally obliged not to remove that appliance after showing the home is a principle that most helps to justify the real estate agent's argumentation.