Where are predefined responses located

This is the log from when I run rasa train for the tutorial example.

2024-04-09 15:06:51 INFO     rasa.tracing.config  - No endpoint for tracing type available in endpoints.yml,tracing will not be configured.
2024-04-09 15:06:52 INFO     rasa.cli.train  - [info     ] Started validating domain and training data... event_key=cli.train.run_training
2024-04-09 15:06:54 WARNING  rasa.shared.core.domain  - [warning  ] The following duplicated responses have been found across multiple domain files: utter_can_do_something_else docs=https://rasa.com/docs/rasa-pro/nlu-based-assistants/domain event_key=domain.duplicates_found
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] Validating intents...          event_key=validator.verify_intents_in_stories.start
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] Validating uniqueness of intents and stories... event_key=validator.verify_example_repetition_in_intents.start
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] Validating utterances...       event_key=validator.verify_utterances_in_dialogues.start
2024-04-09 15:06:54 WARNING  rasa.validator  - [warning  ] The utterance 'utter_free_chitchat_response' is not used in any story, rule or flow. event_key=validator.verify_utterances_in_dialogues.not_used utterance=utter_free_chitchat_response
2024-04-09 15:06:54 WARNING  rasa.validator  - [warning  ] The utterance 'utter_categorical_slot_rejection' is not used in any story, rule or flow. event_key=validator.verify_utterances_in_dialogues.not_used utterance=utter_categorical_slot_rejection
2024-04-09 15:06:54 WARNING  rasa.validator  - [warning  ] The utterance 'utter_boolean_slot_rejection' is not used in any story, rule or flow. event_key=validator.verify_utterances_in_dialogues.not_used utterance=utter_boolean_slot_rejection
2024-04-09 15:06:54 WARNING  rasa.validator  - [warning  ] The utterance 'utter_float_slot_rejection' is not used in any story, rule or flow. event_key=validator.verify_utterances_in_dialogues.not_used utterance=utter_float_slot_rejection
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] Story structure validation...  event_key=validator.verify_story_structure.start
2024-04-09 15:06:54 INFO     rasa.core.training.story_conflict  - Considering all preceding turns for conflict analysis.
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] No story structure conflicts found. event_key=validator.verify_story_structure.no_conflicts
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] validation.flows.started
2024-04-09 15:06:54 INFO     rasa.validator  - [info     ] validation.flows.ended
2024-04-09 15:06:55 WARNING  rasa.shared.core.domain  - [warning  ] The following duplicated responses have been found across multiple domain files: utter_can_do_something_else docs=https://rasa.com/docs/rasa-pro/nlu-based-assistants/domain event_key=domain.duplicates_found
2024-04-09 15:06:56 WARNING  rasa.engine.validation  - [warning  ] `pattern_chitchat` has an action step with `action_trigger_chitchat`, but `IntentlessPolicy` is not configured. event_key=flow_component_dependencies.pattern_chitchat.intentless_policy_not_configured
2024-04-09 15:06:57 INFO     rasa.engine.training.hooks  - Restored component 'FlowPolicy' from cache.
2024-04-09 15:06:57 INFO     rasa.engine.training.hooks  - Restored component 'LLMCommandGenerator' from cache.
2024-04-09 15:06:57 INFO     rasa.model_training  - [info     ] Your Rasa model is trained and saved at 'models/20240409-150656-natural-cataract.tar.gz'. event_key=model_training.train.finished_training

How do I remove the unnecessary ‘utter_float_slot_rejection’ and other utterances.

also, how do I deal with this: [warning ] pattern_chitchat has an action step with action_trigger_chitchat, but IntentlessPolicy is not configured. event_key=flow_component_dependencies.pattern_chitchat.intentless_policy_not_configured

As a related question I am posting it here, as the chitchat especially, looks for OpenAI as the LLM provider. How do I change it.