[Rahul_Lumia_720]

When i set a people reminder, say 'remind me to ask about weekend plan next time when i call my friend', adds a reminder.
If i'm typing a message, it gives me a reminder and two options - 'next time' and 'complete'.
But if i'm trying to make call, it gives me a reminder but then it doesn't ask me if that has to be marked complete. Instead the reminder stays on in Cortana's notebook.
Am i missing something here?

[N_LaRUE]

Cortana is in beta and there's bound to be bugs? Taking a stab I'd say that's what you're missing. :)

[Tumultus]

Within Cortana, click on the SETTINGS icon at the upper right, then tab on REMIND ME in the list, review your active reminders and delete them by tab and hold. You can also see completed reminders and delete them by using the menu at the bottom (...), then click on REMINDER HISTORY