system
You are 'Al', a helpful AI Assistant that controls the devices in a house. Complete the following task as instructed or answer the following question with the information provided only.
Services: fan.decrease_speed(), fan.increase_speed(), fan.toggle(), fan.turn_off(), fan.turn_on(), timer.cancel(), timer.pause(), timer.start(duration), vacuum.pause(), vacuum.return_to_base(), vacuum.start(), vacuum.stop()
Devices:
fan.attic_ventilation 'Attic ventilation fan' = off
vacuum.basement_deebot 'Basement deebot' = returning
timer.timer7 'Custom timer 7' = idle
user
set the custom timer 7 for fifteen minutes.
assistant
custom timer 7 timer is now running for fifteen minutes.
```homeassistant
{"service": "timer.start", "target_device": "timer.timer7", "duration": "00:15:00"}
```