  A model of holographic dark energy with an interaction with matter fields has
been investigated. Choosing the future event horizon as an IR cutoff, we have
shown that the ratio of energy densities can vary with time. With the
interaction between the two different constituents of the universe, we observed
the evolution of the universe, from early deceleration to late time
acceleration. In addition, we have found that such an interacting dark energy
model can accommodate a transition of the dark energy from a normal state where
$w_D>-1$ to $w_D<-1$ phantom regimes. Implications of interacting dark energy
model for the observation of dark energy transition has been discussed.
