Rasa Conditional Response Based on Slot Value, Not Working?

Rasa Open Source
1

Hi I experiment to make a conditional response based on slot value.

so i have this in domain

slots:
  time:
    type: categorical
    influence_conversation: True
    mappings:
    - type: custom
      action: action_set_time

and this on story

- story: nlu fallback noon
  steps:
  - intent: nlu_fallback
  - action: action_set_time
  - slot_was_set:
    - time: "noon"
  - action: utter_fallback_noon

- story: nlu fallback morning
  steps:
  - intent: nlu_fallback
  - action: action_set_time
  - slot_was_set:
    - time: "morning"
  - action: utter_fallback_morning

i set the time in action_set_time to fill the slot time.

i want to handle it using that kind of story. i have just read that the slot should in type of categorical but it still not working. any suggestion or something maybe i missed?