How to query Range

Right now my code is is Equals in the query how can i prevent for example that if i book 2014-12-01 01:00 to 2014-12-02 01:00 This is a hole day, that no one else can for example book the same time but between any time and that range?

My code looks like this right now.

var camlQuery = new SP.CamlQuery();

    camlQuery.set_viewXml('<View><Query><And><Eq><FieldRef Name=\'EventDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>'
        + fromTime.toISOString() + '</Value></Eq><Eq><FieldRef Name=\'EndDate\' /><Value IncludeTimeValue=\'TRUE\' Type=\'DateTime\'>' + toTime.toISOString() +
        '</Value></Eq></And></Where></Query></View>');


    this.collListItem = list.getItems(camlQuery);
    context.load(collListItem);