Bind a delegate called OnRequestFinished in BeginPlay()
AAIController* AIC = Cast(GetController());
AIC->GetPathFollowingComponent()->OnRequestFinished.AddUObject(this, &YourPawnClass::YourMethod);
The method have to take 2 parameters FAIRequestID and const FPathFollowingResult&
OnMoveCompleted Delegate is deprecated, Use OnRequestFinished instead