To reassure cats that don't let me touch them or come near and are terrified, I use my voice. I've seen some videos on YouTube that show how to talk in a calming, reassuring way, and boy do they help.
The Royal von Meouw Dynasty: His Royal Highness the late Prince von Meouw,
Her Royal Highness Princess Gatita von Meouw, Nikita Duchess of Meouw and
His Highness Cuchi-Cuchi, next in line for the throne of Prince von Meouw.