The built-in Neutral Letter template has a P.S. line that states how you can be contacted and during what office hours if the owner is interested in an offer.
If you would like to change and customize this P.S. line you can do so under the ‘Customize> Letter Template Settings> Letter P.S. Line’ option.
NOTE: Keeping this field blank will draw from the default values of the system. But entering a custom value overwrites the custom text.