Original checkin/checkout date when reservation altered.

Hello,

As a property manager&host, I want to be able to include %original_check_in_date%, %original_check_out_date% to the template that get sent to my team, when the reservation is altered.

At this moment, when reservation is altered, template only allows %check_in% and %check_out%, which is the updated date. But my cleaning team wants to know what original date was as they are managing their own calendar.

Thank you.