Then Jonathan said to him, Tomorrow is the new moon: and you will be missed, because your seat will be empty.
There is nothing here that demands any special comment.  The signal by which David would know whether or not he was an outlaw condemned to flee from the wrath of the king, or if a reconciliation could be brought about - that signal was clear enough.  It would turn upon Jonathan's words to the lad who would be assigned to chase his arrows.