Dialogflow work addition

The agent name is (Fairfield) the database name is (admin_drywall) under [login to view URL] domain name 1. I need to secure the agent by verifying a users name and passcode are in database before they can use the agent. If the username is in database table (login) then proceed to welcome intent if they are not in the database then exit the agent. 2. I have the intent (time card) that asks 7 questions and saves the answers to the database table (drywall). I added intent (material) that asks 3 questions the DATE question should just be todays date it shouldn't ask the date it should just use todays date. I need these 3 questions to be stored in the database table (material). 3. I need the welcome intent to be pulled from the database table (welcome) which is just the one field.