"I'm here; where are you?"   

Carrie: "I'm driving; what are you doing?"  

"I'm thinking about John."  

Carrie: "What are you thinking?"  

"I'm not sure.  What do you think?"  

Carrie: "I don't know......"  

Carrie:  "OMG!"
.
.

"Carrie?"  "Carrie?"  "Carrie?!"