Whoa! The chatbots are getting smarter! Hello customer retention!
E.g., we notice you do not have any money. If you promise to make a deposit tomorrow, I can add $10 no deposit right now.
Or, how about this:
"If you send me an email of one of your friends who is not registered, I will give you $5. If they register and make a deposit, I will give you a $100 bonus."