I Need To Ask You That While I Am Trying To Book One Person In Training For A Business Event Type, They Are Saying That This Person Is Not Available For The Business Event. Why Is It So? But That I Can Book A User For The Same Business Event Type. What Is The Differense Between User And Person? Now In Case If I Book A Person For The Business Event, How Can I See Whether That Person Is Available For That Date Or Not. Moreover How Can I See That That Person Is On Leave Or Not.