In Agile, changes are expected and are part of the iterative process. The product owner should take the opportunity to coach the stakeholder on agile principles, explaining how continuous feedback, flexibility, and adaptability are core to delivering value in an Agile project. Instead of pushing back on changes, the product owner can help the stakeholder understand that responding to change helps improve the product and better meet user needs. This helps align the stakeholder's expectations with Agile practices and fosters better collaboration throughout the project.