From now on, agents can send an email to a customer who left the queue. All it takes is going to the queue abandonment report and clicking on the Message button. All messages and replies can be seen in Tickets.
Note that this feature is available only for Business and Enterprise plans. Consider an upgrade if you don’t want those “Come back!” screams in your office.
If you want to make sure the queue doesn’t happen at all, check your chat peaks and adjust agents’ shifts accordingly. It should help!