Dear Yong Peng,

OYP> I think you are right about "no" being an emphatic.

"No" here is a first person plural enclitic (Acc., Dat., Inst., Gen.).

I think here it is Genitive "our".

> DN25 Udumbarika Sutta CSCD55/PTS3.40
> Aya.m kho no, bhante, antaraakathaa vippakataa; atha bhagavaa
> anuppatto.

For, Venerable Sir, this our mutual talk is left unfinished,
and now has reached the Blessed One.

Mettena cittena, Dimitry