You might imagine that any one of those would be close enough for an intelligent assistant to figure out. But Eva's reaction was "I'm sorry, I heard what you said but I don't know how to interpret it. Please try again."
Eva also had the annoying habit of popping up unsummoned--even when my phone was asleep--to read calendar entries to me. "Hi Ed, I'm reminding you about conference call with Stacey in CR-500 at 5 p.m." Even more annoying was that the app insisted on reading each calendar entry three times. Eva's instructions said that the virtual assistant would be quiet if I asked it to, but the ensuing peace lasted only until my next appointment, when Eva would again implore me three times not to miss the impending meeting. There may be another way to get Eva to shut up, but I never found it. The app's instructions are the longest and wordiest of any mobile app I've seen; and after plowing through them for a while in hopes of solving an immediate problem, I usually lost patience with trying to use them.
Finally, I wrote a calendar entry reminding me to uninstall Eva as soon as I'm done with this story. That may be the only time I'll be glad to hear this virtual assistant's voice.