Alter Aeon Online Help

Keywords are:  'thief skill fast talking fasttalking'

Skill: fast talking             Lvl 30 Thie  (21%)
                                (helpful)   Requires: case
                                Group: Thief stealing skill group

The thief 'fast talking' skill can be used in a number of situations,
generally to create enough doubt in the mind of a mark for the thief
to escape unscathed.  Thieves that concentrate on shoplifting and
petty theft generally have this skill, as it requires more interaction
with marks than unattended burglary and dungeon plundering. The
skill used automatically when the situation requires it.

Having a high charisma greatly improves the success of this skill.