Is it possible to integrate a booking form that doesn't allow the user to select a previously selected date or time?

For example if someone already booked something for 3PM today, the new user should not be able to choose 3PM again for today since it's already booked.

You can use our Appointment Slots Widget, it will show your users what times are available, and you can also use it to limit how many people can select a certain time, because the widget reduces the number of selected slots each time the form is submitted. 

Thank you.