The person who respects a small boundary makes larger trust easier to imagine.

Trust gets built out of samples. Someone who hears no about something minor and simply accepts it has just shown you what they do when they want something and cannot have it, which is the only useful information about how they would handle anything larger later on.

Watch what happens the next time you decline something small: the second ask, the joke about it, the change in temperature. And when somebody tells you no this week, take it at first asking, without negotiating.