Is there a way to create a form reservation for time slots?

How can you create a dropdown that allows slots to be no longer avaliable if someone has already signed up for that slot?

We are doing a meeting where people can sign up for specific time,  we have 4 spots per time period. is there a way that allows us to have a sign up that changes options as people sign up on a reservation form.

Hi Blake, although there's no way for you to do that with a dropdown menu, you can still achieve something similar by using widgets.

Here's a demo form https://form.jotform.com/62496269258975 showing how the Appointment Slots widget works. The idea behind this widget is to allow your users to pick a slot (be it a time, a date, or let's say, a product that has limited stocks) and the counter continuously decrements for each submission. Once the counter reaches zero, then no one can pick that time period anymore.

In your case, since you mentioned you have 4 slots per time period, I have set the widget's properties to allow 4 slots per time:

You may clone the test form I did (here's how) so you can see how it was setup. And here's a quick guide on How-to-Add-a-Widget-to-your-Form 

Give it a spin and don't hesitate to ask if you bump into an issue while setting it up.