Cortana has been a bit moody, recently. Previously, I would say, 'set an alarm for 30 minutes from now' and all was good. Yesterday, I tried it and all I got was a Bing search for alarms. Tried 'set an alarm for 10 minutes' - Bing, 'set an alarm for 10 minutes, from now' - Bing, then just 'set an alarm' - again, Bing search. Today, she's back to 'normal'. Strange.