reservation-successfully-sent-how-to-change-this-message – reply to other thread

In thread http://easyreservations.org/forums/topic/reservation-successfully-sent-how-to-change-this-message/, I would have thought then that I could remove that message to, but don’t see it being given in the Standard form. This message apears after the person has submitted the reservation, so it must come from somewhere else?

When you add it through the shortcode creator you can define all messages.
Regards