2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223742A model where chiral boson is coupled to a background dilatonic field is considered to study the s-wave scattering of fermion by a back ground dilatonic black hole. Unlike the conclusion drawn in \cite{MIT} it is found that the presence of chiral fermion does not violate unitarity and information remains preserved. Regularization plays a crucial role on the information paradox.11 pages latex fileHigh Energy Physics - Theorytext