How to change the replyto/from email.

I know how to change the admin email etc for wordpress but I only want to change the reply to and from email for appointments+ plugin. Customers are replying to the conf/reminders and it's coming to me the admin rather than the dummy user/provider we are using for everything. I've searched and read through what I can find on here but I'm really hoping there is something that can be changed just for the plugin and not have to mess with the WP mail as we have many forms set up and I don't want to affect them.

Thank you!