Also please take a look at https://www.bryntum.com/examples/scheduler-latest/examples/kitchensink/#examples/timeresolution
just click & drag and You will have a new slot.

I'd like to have same functionality

Creating an event with click and drag can be implemented with a button, click and drag over time slots, then click button to create new event where you set start and end to the start and end time in gathered from the change event of the scheduler.

Until this feature is available you can use the following custom solution using the scheduler selection: 
http://dojo.telerik.com/eqUgI

Take a look at the following demo to see an example of this behaviour: 
http://carrental-app.scheduler-net.com/ 

Please implement the functionality which makes it possible to make a reservation/booking by clicking and dragging in the Kendo Scheduler (i.e. marking time slots w the mouse). You click and hold down the mouse pointer over a time slot, and then drag the number of days/hours the reservation should be valid. This functionality I have seen in several of your competitors scheduler controls.