Conditional edges

Straight lines can't ask questions

Your parser now finds the dog's name — when the user included it. But what if they don't? "Book a walk in Mission tomorrow" has no name. Today the graph barrels straight into draft_booking and drafts a booking with dog_name = None. Rude.

A better assistant would branch: if the name is missing, ask a follow-up question instead of drafting. A fixed add_edge can't do that — it always goes the same way. You need a conditional edge.