At a particular location, they don't always take lunch at a fixed time, so they're asking if they can have a button to press on the phone that will manually enable/disable lunch mode. So say they leave at 12:35PM and press the button, All incoming calls should route to Auto Attendant and callers should hear custom service greeting 3 stating that it is lunch time. Then say they return to the office at 2pm, they hit the button to go back to normal mode. Is this easily accomplished?