Salesforce bulk API Job - Update

Hi, I need to update records in SFDC. All I need to update the end date on all the records that are in a spreadsheet (Spreadsheet has Id and End date).

When I try to use the SFDC Bulk API to update these records, I get the status as failed.

Does anyone have an example of using SFDC Bulk API activity to update records?

Thanks,
Vaneet