Hello! I created the sequence chart below to depict a scenario of interaction between a library patron and the new Thrive University (TU) library system.

Scenario: Loan Management and Return

Description: Carol, a user with a reserved book, borrows it and later returns it.

Explanation:

1. User (Carol): Logs into the system and checks the status of her reserved book.
2. System: Confirms the availability and allows Carol to borrow the reserved book.
3. User (Carol): Borrows the book and receives a confirmation message.
4. User (Carol): Later, initiates the return process for the borrowed book.
5. System: Validates the return request and updates the book status.
6. System: Sends a return confirmation message to Carol.

Could you help me create an Entity Relationship Diagram for this scenario? Thank you in advance!