Abu Dharr used to say about a person who makes the intention of Hajj but he repeal it for the ‘Umrah (that will not be valid). This cancellation of hajj for ‘Umrah was specially meant for the people who accompanied the Apostle of Allaah ﷺ.  

أَنَّ أَبَا ذَرٍّ كَانَ يَقُولُ فِيمَنْ حَجَّ ثُمَّ فَسَخَهَا بِعُمْرَةٍ لَمْ يَكُنْ ذَلِكَ إِلاَّ لِلرَّكْبِ الَّذِينَ كَانُوا مَعَ رَسُولِ اللَّهِ ﷺ  

I asked: Messenger of Allah, is the (command of) cancelling hajj meant exclusively for us, or for others too? He replied: No, this is meant exclusively for you.  

قُلْتُ يَا رَسُولَ اللَّهِ فَسْخُ الْحَجِّ لَنَا خَاصَّةً أَوْ لِمَنْ بَعْدَنَا قَالَ بَلْ لَكُمْ خَاصَّةً