Extracting date from user

hello please can u show me how i can succes to ask user start date and end date by your experience

forms: transaction_form: required_slots: start_date: - type: from_entity entity: date role: start intent: inform_date_range - type: from_text intent: inform_date end_date: - type: from_entity entity: date role: end intent: inform_date_range - type: from_text intent: inform_date

In which file we have to put these form?