Good day!
Give me advice, please, what to read about condition for visibility button of inline keyboard. I want to check if a timeslot free, and show or hide button
Hey @ipkvitov,
Welcome to the community 
Your post is missing a lot of information, what is the inline keyboard for? Where are the slots coming from?
You have also not filled out the template we provide, would you be able to do this so we can help you.