The best practice for your incoming leads is to be sure you are converting your leads! You want to be sure you're working through your leads page efficiently and daily. Please note, there is not a way to mass convert leads all at once from your leads page.
If a lead is inquiring and valid, you will then want to convert the lead to a prospect event. Prospect events are the beginning stages of a booking and will allow overlap amongst other prospect events.
If the lead is not justified by you or your team and does not want to move forward with the booking process, you will then want to convert the event to a Contact/Account. By doing so, it will preserve their information on your site for future use in case they would like to book again, or you would like to reach out in the future.