Pull Request

Please describe the tests that you ran to verify your changes.

[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[x] My changes generate no new bugs
[x] I have added tests that prove my fix is effective or that my feature works
[x] New and existing unit tests pass locally with my changes
[x] Any other comments, questions or concerns? Changed methods and tests for getting user bookings and total costs and added attribute to store bookings.