It has been suggested that a space-time of radius has a holographic dual, living at future space-like infinity with the bulk wave function being dual to the partition function of the boundary theory [ArXiv : astro-ph/0210603]. We consider some aspects of this correspondence. For under-damped scalars (), belonging to the principal series, we show that for the Bunch-Davies vacuum a suitable source in the boundary theory can be identified in terms of the coherent state representation of the wave function. We argue that terms in the resulting correlation functions, which are independent of the late-time cut-off, satisfy the Ward identities of a Conformal Field Theory. I will also comment on the cut-off dependent terms, violation of reflection positivity and other possible ways to identify sources both in underdamped and overdamped () cases arguing that these too can lead to correlators satisfying CFT Ward identities.