Draw and submit one or more UML sequence diagrams for the following elevator user story:

As a user of an elevator building, I need to be able

to call an elevator to my floor and ride the elevator to another floor.
know that my elevator request is being serviced (and that the elevator is not out-of-order).
stop the elevator doors from closing on me as I enter or exit the car.
know that I have arrived at the correct destination floor.
signal for help in an emergency within the car