Answer:  You have to use their name!  And play with it. Make it rhyme or find other complimentary words that start with the same sound.
Is her name...
Cindy: Sweet Cindy Loo
Ariel: Adorable Ariel-a-pie
Rachel:  Rachel Pretty Eyes 
Is his name...
Dave: Darling Dave (or Davey, if you think he can handle that)
Edward: Mr. Edwonderful
Pete:  Sweet Pete 
Matt:  Magnificent Matt
   
 
