Rasa-core: 'action_default_fallback' triggered for valid input

Hi @amn41, I got below response

2020-01-22 19:32:47 DEBUG    rasa_core.policies.memoization  - Current tracker state [{'intent_thanks': 1.0, 'prev_action_listen': 1.0}, {'prev_utter_location_name': 1.0, 'intent_thanks': 1.0}, {'intent_greet': 1.0, 'prev_action_listen': 1.0}]
2020-01-22 19:32:47 DEBUG    rasa_core.policies.memoization  - There is no memorised next action
2020-01-22 19:32:47 DEBUG    rasa_core.policies.form_policy  - There is no active form
2020-01-22 19:32:47 DEBUG    rasa_core.policies.ensemble  - Predicted next action using policy_2_FallbackPolicy
2020-01-22 19:32:47 DEBUG    rasa_core.processor  - Predicted next action 'utter_default' with prob 1.00.
2020-01-22 19:32:47 DEBUG    rasa_core.processor  - Action 'utter_default' ended with events '[]'
2020-01-22 19:32:47 DEBUG    rasa_core.processor  - Bot utterance 'BotUttered(text: I am not sure what you're aiming for, data: {
  "elements": null,
  "buttons": null,
  "attachment": null
})'

Please let me know the feedback.Thanks