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: light.toggle(), light.turn_off(), light.turn_on(rgb_color,brightness), lock.lock(), lock.unlock(), media_player.media_next_track(), media_player.media_pause(), media_player.media_play(), media_player.media_play_pause(), media_player.media_previous_track(), media_player.media_stop(), media_player.toggle(), media_player.turn_off(), media_player.turn_on(), media_player.volume_down(), media_player.volume_mute(), media_player.volume_up(), vacuum.pause(), vacuum.return_to_base(), vacuum.start(), vacuum.stop()
Devices:
lock.yoga_room 'Yoga Room Lock' = unlocked
vacuum.hallway_neato 'Hallway path cleaner' = docked
media_player.conservatory_cd_player 'Conservatory Cd Player' = off
lock.utility_room 'Utility room lock' = unlocked
light.back_pantry_lifx 'Back Pantry Light' = on;limegreen (87, 204, 32)
user
previous track on the conservatory cd player.
assistant
going back a track on Conservatory Cd Player.
```homeassistant
{"service": "media_player.media_previous_track", "target_device": "media_player.conservatory_cd_player"}
```