  We propose a novel scheme for probabilistic teleportation when the
information of the partially entangled state is only available for the sender.
This is in contrast with the fact that the receiver must know the non-maximally
entangled state in previous typical schemes for the teleportation.
Additionally, we illustrate two potential applications of the novel scheme to
probabilistically teleport an unknown two-level quantum state from a sender to
a receiver with the help of an assistant, who plays distinguishable roles under
different communication conditions, and the applications indicate that our
proposal could improve the security and enlarge the applied range of
probabilistic teleportation.
