We have customers that send inquiries and then don't come back to book. I'd like to send an automated email to follow up with them. This email should go out to customers that sent an inquiry but did not book. It should go out 3 days after their inquiry was made. So, if a customer made an inquiry and was sent a quote but 3 days later he still did not book, the email should be sent to that customer automatically (unless the lead was closed).