Email permissions

I have created a “Reservations” user and assigned the role “Bookings Manager” to the user. That’s great at restricting the dashboard, but does not allow the user to use the “Email” button on the far right of the bookings list. How can I get around this without opening up the rest of the dashboard to the user?

https://wordpress.org/plugins/wp-restaurant-manager/