Could someone please provide me with an example of how to use checkpoints?
I am confused as to where we define the actual checkpoint. For example in: `## first story
- hello
- action_ask_user_question
check_asked_question
user affirms question
check_asked_question
- affirm
- action_handle_affirmation
user denies question
check_asked_question
- deny
- action_handle_denial`
Where is the check_asked_question actually defined? What is it? I know it a repeated story example, however, where do I create it?