Hello Please I need help with creating a Class Diagram and Sequence Diagram. Thank you!!

Use Case Name	Add a class to a schedule
Triggering Event	Demand for a class
Brief Description	Allows the Registration Staff to add a class to the weekly schedule.
Actors	Registration Staff
Related Use Cases
Preconditions	Registration Staff has opened the class and schedule menu
Post Conditions	Class is scheduled and ready for Registration
Flow of activities	Actor		System
	1.	Selects the Semester Schedule option	Displays a list of Semester/locations, prompts for selection
	2.	Selects semester and location	Displays a weekly calendar for the semester/location, displaying classes currently scheduled. Displays a list of classes.
	3.	Selects class, day of week and start time to add to schedule	Displays a weekly calendar for the semester/location, displaying classes currently scheduled. Displays a list of classes.
	4.	Repeat above step until all classes have been added to the schedule Requests to save	Scheduled items are save.
Exception Conditions	Registration Staff choose to cancel scheduling classes