If you like to view your booking calendar by week please consider the following. The start day of the week is dependent on the users' locale. This is defined in the user object and can be changed only by the administrator. Here are two examples:
User with Locale English (US)
Will see the weeks in the booking calendar start on a Sunday and end on Saturdays.
User with Locale German (DE)
Users with a German locale will see the weekly booking calendar as follows: Weeks starting on a Monday and end on Sunday.
Info
Please make sure that you align the locale of your sales reps with the way you are selling your weekly advertisements in your media campaigns.