Set your availability in a way so that you can have enough notice time before meeting gets scheduled.

Step 1: Go to Appointment Booking Page and Click on "Manage Appointment Types" on Booking Page of your choice.

Step 2: Click "Change Hours" on Appointment Type where you wish to receive enough notice

Step 3: Locate "Ensure meetings are scheduled with enough lead time" option and check that option.

On right side of screens there are few options. This is one of them.

Step 4: Click on "Save" and go back.

This way you can ensure meeting does not get scheduled right now.