What are the Use cases narrative (for each use case) of the following statement?

A charitable society sells lottery tickets to raise funds. The fundraising is carried out in the form of campaigns to support currently important charitable causes. The society keeps a list of past contributors (supporters). For each new campaign, a subset of these supporters is preselected for telemarketing and/or direct mail contact. The society uses some innovative schemes to gain new supporters. These schemes include special bonus campaigns to reward supporters for bulk buying, attracting new contributors and so on. The society does not randomly target potential supporters by using telephone directories or similar means. To support its work, the society has decided to contract out the development of a new telemarketing application. The new system is required to support a significant number of telemarketers working simultaneously. The system must be able to schedule the phone calls according to prespecified priorities and other known constraints. The system is required to dial the numbers for the scheduled phone calls. Unsuccessful connections must be rescheduled and tried again later. Telephone callbacks to supporters must also be arranged. The conversation outcomes, including ticket orders and any changes to supporter records, ought to be maintained.