function lookUpProfile(firstName, prop){
if (contacts.firstName.hasProp(firstName) && contacts.hasProp(prop)) {
  return contacts.firstName.firstName;
}
  else if(!(contacts.firstName.hasOwnProperty(firstName))) {
          return "no such contact";
}
  else if (contacts.firstName.hasOwnProperty(firstName) && (!(contacts.hasProp(prop)))) {
  return "no such property";
}
}