Hi Calvin,

There's a list here of customisable Default notifications which can be used in Seminar sessions (I assume thats what you mean).

https://help.totaralearning.com/display/TL110/Seminar+notification+templates

Theres some info about waitlisting here you may find useful:

https://help.totaralearning.com/display/TL110/Wait+lists

Let me know how you get on.

cheers,

George