I am new to this forum. Bought 2 UA tickets(w class) for me and my son (12 y)to go to Paris, France to see my brother from PHX in 2 weeks. We were suppose to fly back together. Now, my brother is going to take my son from Paris to China to see my dad. That means my son will miss the segment coming back from Paris to PHX. Should I inform UA about this change? Will I get any credit for the segment my son is not going to fly?