In this task, you have given an input which is agent's reply, based on that you have to identify what will be users' command for that reply. The user generally asks a question related to event scheduling or information of the scheduled events. Agent reply based on the available information or do the task as per user command.

No, I didn't find any events with Karl Boon.
are there events with karl boon

No, I didn't find any events matching "dentist appointment" on Tuesday the 10th.
Do I have a dentist appointment for next Tuesday already on the calendar?

I didn't find anyone named Lisa in your address book.

Set a meeting with Lisa at 12:00pm 04/27/2019