Mack is right on. As an agent, I work for whoever the owner is until the house sells, I'm fired or I quit. If a listing is overpriced all an agent can do is supply the data and make the requests. If you haven't done so yet, I'd forget about the asking price and make an offer for what you feel it's worth. Nothing tells a seller what a home is worth like an offer. All offers must be presented. The bank can accept, reject or counter offer. You'll never know until you try. Best of luck.
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But there's a lot more to the story...
Banks hire listing agents to list their foreclosed properties but almost always ask for some kind of a marketing update once the property is on the market. You would expect an agent to provide some kind of update to any seller but Banks usually have an online form that they ask for the listing agent to fill out. Most of the time Banks will ask the agent to answer a question like "Why do you believe the property has not yet sold?" or "Do you believe that this house is still priced correctly?".
So even though the listing agent cannot actually change the price, they usually can have some influence with the Bank or seller regarding pricing.
Hope that helps! Good Luck!