interface UserInterface
{
    public function getEmail();
    public function setEmail($email);
    public function getPassword();
    public function setPassword($password);
}

interface UserServiceInterface
{
   public function getUserByEmail();
}

class PasswordResetService
{
   public function getUserByEmail($email)
   {
       $user = $this->userService->getUserByEmail($email);
       if ($user) return $user;

       $user = $this->recruiterService->getUserByEmail($email);
       if ($user) return $user;

       // etc ...
   }
}