If you are assigned a specific date, you can only shop that date. You would need the scheduler to reassign the shop to your new date. They may have multiple visits that need to be spread out.
Your report is due based on when the shop is performed. The final due date is related to the overall date range for the project.
Very few shops allow a full range of dates to randomly shop on.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson