Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear MKUAB,
Greetings!
Thanks for reaching out to this community.
Based on your description, I understand your query about Bookings.
According to Define your services in Shared Bookings | Microsoft Learn, you can adjust the Maximum attendees per event settings when setting up new service to restrict the number of attendees. And it doesn't appear to be built-in option/setting to ensure the individuals can only pick one of the dates available
If you have further concerns upon this query, I would like to share some information with you: Since Microsoft has specific support channel capabilities for certain scopes and different support attributes and we provide some limited knowledge about some aspects of the scenarios. For questions specifically related to Microsoft Bookings, it's recommended to post on our dedicated community for Microsoft Bookings - Microsoft Community Hub. You will be able to find specialized experts in this matter that can provide unique solution to this issue.
I apologize for redirecting you to a different community. Please believe this step will ensure faster and more accurate assistance for your specific scenario.
Appreciate your patience and understanding and thank you for your time and cooperation. Have a nice day!