If you don´t want to get booked at certain times during the day you can set up your availabilities.
Go to the availability settings
Set up your availabilities for each day of the week
You can also enable some other settings like buffer times before and after a meeting, preventing from booking you on the same day, and some other options.
After finishing this process people will only be able to book you in the time frame you want.
Next, to setting availabilities the Vyte Page offers much more ways to customize it.