Dispatch is who decides whether your call is a Tuesday slot or a truck tonight.
Someone has to match the job to the tech: a boiler is not an AC capacitor. Dispatch keeps the board honest, calls if we are running late, and pulls the emergency line when the weather turns.
If you call the office, this is the role that answers with an arrival window instead of a shrug.
The right truck, the right window, the right urgency. If you book this kind of work, this is the seat on the truck that is accountable for it.