Not natively, although there are some plugins that can do it (Comala workflows and Scroll versions are the two I've used that do it, there may be more). Confluence will try to merge changes if two people edit at the same time.
And in version 6, it becomes redundant because you will be able to see the other editors and collaborate with them directly.
Without plugins, the best you can do is open a page for edit, stick "only me" on the "who can edit" restriction, and then remove it when you're finished.
An addon but will do what you ask..
Comala will work but only if they are assigned to Blueprints not Templates because if you have edit rights templates can be fudged, where as Blueprints cannot be fudged unless you an admin of the system.
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