Showings can be canceled a number of ways. Most often they are canceled by the showing agent responsible for the showing or by ShowMojo when a listing is taken off the market.

The messaging informs the prospect that the showing has been canceled. Email messages can include customized template or situation-specific messages. Also, ShowMojo Sends Text Messages about Canceled Showings When Needed. 

Note that this article is describing the communication for only canceled showings. Rejected Showings and Declined Showings may be communicated to the prospect in other ways.