A) We are providing automated email system. In automated mail system, we have provided mail configuration setting form there merchant can write or customize text and setting that he/she wants to send customer when he/she is approved, cancel and so on customer emails. these emails are provided communication between customer and merchant. 

Go to WooCommerce-> RMA Configuration -> Mail Configuration setting
And from this setting, you can set complete mail setting for WooCommerce refund and exchange (WooCommerce RMA) process.