Send Custom Email to a User

Hy,
In our booking form the users are able to add a question to the registration in a text area on the booking form. Is it possible to comment on the question by sending an email to the user directly from the frontend registration ? How can this be done?

Is it possible to comment on the question by sending an email to the user directly from the frontend registration

I don't understand exactly how you want it to work. Could you please explain more details ?

Tuan