Best I can do on the second banter (Cass-Sera). Bull and Sera, the first banter, were almost totally unintelligible due to Mike + Cam, but they might have been talking about something of Hubert's (?) falling down the stairs, which was apparently hilarious.
CASS: Another guess, Sera: were you born in Denerim?
SERA: What? No. Is that what you're [try?]ing for?
CASS: That was the question that began this whole thing!
SERA: That was your question. I just [???????????]. And besides, I don't know - or much care - where I was born.
CASS: ...Ah.
SERA: [????? - possibly "Hey, don't look at me."]
Close enough? Tsk. A little clarification because you guys didn't get any who-likes-who in the ancient interviews.
CASS: Another guess, Sera: were you born in Denerim?
SERA: What? No. Is that what you're trying for?
CASS: That was the question that began this whole thing!
SERA: That was your question. I just hoped something on the map would rhyme with "arse." Besides, I don't know or much care where I was born.
CASS: (Sighs, clears throat.) Arse.
SERA: Aww, for me? (laughs).
Also did you hear Sera's after battle remark, I think she said "Fists up Face Down", aha.
It's at the 13:20 mark on video 2.
Bits up, face down!
Because, you know, she can't always be sure they have fists.