Greeting
From Wild World Wiki
A greeting is the way most residents begin conversation with you. Every resident NPC has their own indvidual greeting to start with, however during the course of the game they may ask you to make up a greeting for them. If you choose to do this, you will be shown the keyboard screen and given 16 characters with which to come up with a new greeting. This greeting will over-ride the townsperson's orignal greeting, and they will use it in exactly the same way they used their original greetings.