Life does not always speed along in predictable ways. Things happen that cause our course to change.
So it must be for your characters.
These happenings can be relatively insignificant, such as the restaurant running out of tomatoes. Such tiny things will barely cause a ripple in your character’s life.
What happens, however, when something huge gets in the way of what he wants to do? How will he react?
Imagine a scene in which your character’s plans are thwarted. She intends to do something, but can’t. What will she say and do?
Write that scene, remembering to include emotions. We must be able to feel her angst and confusion. We must experience the situation as strongly as he does.
Draw in your reader.
Have fun with this one.