This may be because the item is already rented and not available. Please contact us at info@islarentals.com.mx. Another reason for not being able to book is that we need 24h to organize delivery and pickup, so if you're trying to book for the next day, you can find us on email, or phone number (we also have WhatsApp): +52 998 227 4542, or Facebook Messenger on our Isla Rentals page.