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Cloud computing has gained popularity in recent times. Nowadays several companies are migrating their software towards cloud providers. Using virtual machines as a resource provisioning mechanism offers some benefits, but depending on the applications it could be difficult to preview the exact amount of resources the company needs to provide QoS to its clients. In this paper we propose a new way of booking resources in which the Cloud user can set min and max levels to cope with peak-load. For this proposal we need to modify some components of the cloud infrastructure: a new module for the booked virtual machine, some changes in advance reservation leases from cloud manager and some background for SLA layer.