Be careful, guys. When engaging this kind of services, never share your private keys.
This is a new account. If you intend to offer this service legitimately, you should consider escrowing a certain amount of bitcoins with a reputable escrow provider. If you don't agree to this, you must be deranged if you think people will blindly send you their wallet files with 10+ bitcoins on it.
If anybody have no believe then they can try CoinsRecover.com as a last resort (a final course of action, used only when all else has failed.).