Well the only moment that i could say Eric and Calliegh briefly talk was in Season 9 was Episode 2
Here Quoted Dialogue of Eric and Calleigh
Season 9 Episode 2 "Sudden Death"
Calleigh: (smiling) "Tell me somethin' good."
Eric: "Okay. I just got the time of the incited incident."
Calleigh:
"All right. I'll take it. Well, the computer receipts say that the
champagne was delivered to Ellison at 11:57pm, so it has to be sometime
after that."
Eric: "It was. The confetti in Kristin's lungs puts her inside the club exactly at midnight when...