final Guest guest = guestService.getGuest(username);
final List<Guest> coaches = buddiesService.getTrustedBuddies(AuthHelper.getGuestId());
if (coaches.contains(guest))
return Response.status(Response.Status.BAD_REQUEST).entity(username + " is already in you coaching buddies list").build();
if (guest!=null) {
return Response.ok(new GuestModel(guest)).build();
} else
return Responses.notFound().entity("No Such User: " + username + ". Please try again.").build();
}