Lost Friends

I would like to know how to contact 

Betty Delgado, who I met in December 1977 in Tucuman, Argentina and who became then my penpal for one year 
until  we both changed our addresses.

Bency from India, who broke the contact with me in 1988 because I did not want to get married.
(Getting married with her could only have been better than the experience I made afterwards.)