What does "to book a tour" mean in English for Spanish?

In English for Spanish, "to book a tour" means:

reservar un tour

Listen to "to book a tour": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 3, Scene 4