UML Event Table: How to determine response of a usecase?

In many usecases, the response is simply some update in some data in the datab开发者_开发技巧ase and a response to the user simply confirming the action was successful. In this case do I still specify the Response?

In an event where a report is generated from a temporial/state event, and only database is changed. Do I state a response/destination. Suppose the user will make a separate request for the generated database

In general, how do I determine the response?

UPDATE

Suppose the use case "Register new user". Should it look something like below?

• Event: User wants to register as a member
• Trigger: Registration form submitted
• Source: User
• Use case: Register new member
• Response: (do I put something like ...) New Member Created Message
• Destination: (then here ...) User

IMO, maybe you can leave destination blank. That mean data is recorded in system (database).

But, If the proses business give a member card, so the response is Member card the destination User/Customer. CMIIW