Try this
- Name the adjustment and what it made possible. Do not assume the change was effortless because the person agreed.
- Ask about any remaining practical consequence, such as a cancellation task, without making them reassure you that nothing was lost.
A worked example
“Thank you for moving dinner earlier. Did the change leave any booking task I can take care of?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Avoid converting gratitude into a claim on future flexibility. Each new change should still be discussed on its own terms.