You're booking appointments, BDC is booking appointments, what about leads booking their own appointments? Who knows their schedule better than them? 

Use your personal calendar link to allow them to chose their preferred date and time to talk with you. 

On your profile page chose, you can send this link: 

They will be able to sign up for any date and time around your Dabadu Schedule! 

You can see the appointment with the rest in your Master Calendar