Two people keep missing each other. One calls, the other doesn't pick up, then the roles swap, and by the end of the day nothing has been said. The speaker treats this small failure as a real loss: "no meaningful words exchanged" and "no inspiration came." The admission near the end is the heart of it. When the other person isn't around, the speaker has "little to write about," which suggests this person is a source of ideas and energy, maybe a muse as much as a loved one.
The mood is quiet, a little deflated, but not despairing. The lines are short and plain, like a diary note jotted down at the end of a flat day. The final line, "Ill call again tomorrow," gives it a hopeful, patient ending. The title, though, is blunt and frustrated, and it contrasts with the gentle poem beneath it. That gap makes the speaker feel human: annoyed on the surface, but mostly just missing someone.