Thank you for the reply. the following code results in the error message: Can’t set «class az37» of «class azf4» to "testing 2".
I have a contact Test Person
=====
property fName : "Test"
property lName : "Person"
tell application "Contacts"
try
set thePerson to the first person whose (first name is fName and last name is lName)
set theName to the (name of thePerson as text)
set theNote to the note of thePerson as text
display dialog theName & return & return & theNote --> results in "Test Person: testing 1"
set the note of the person to "testing 2" as text
save
on error theError
display dialog theError
end try
end tell