In the media a hostage is often taken as a buffer against being killed, but it can also be a way to get money, or to get attention for a belief. Or a way hopefully to avoid being hurt.
Hostages in ones dream might also suggest that the dreamer is in some sort of disagreement between an employer and employees. For instance the boss, by keeping the struggle going without doing something about the issue, is holding the employees hostage.
Useful Questions and Hints:
What sort of hostage is being depicted in the dream?
Is anything being demanded?
What is your reaction to the dream events?