diff --git a/appointment.js b/appointment.js
index fd0dbb4..f9d3e98 100644
--- a/appointment.js
+++ b/appointment.js
@@ -7,22 +7,38 @@ const mongoManager = new MongoManager();
 
 let excelUtil = new ExcelUtil();
 let contactList = excelUtil.readContacts()
-mongoManager.connect().then(r =>
+let collectionName = formatDate(new Date())
 
-    android.devices().then((devices) => {
-        let segmentNumber = contactList.length / devices.length;
-        for (let i = 0; i < devices.length; i++) {
-            startWithList(contactList.slice(i * segmentNumber, segmentNumber * (i + 1)), devices[i]);
+async function filterAlreadyBookedContacts(contactList) {
+    let alreadyBookedContacts = await mongoManager.getAllSuccessfulItemsForDay(collectionName);
+    let contactsToBook = [];
+    contactList.forEach((contact) => {
+        if (alreadyBookedContacts.find((bookedContact) => bookedContact.email === contact.mail) === undefined) {
+            contactsToBook.push(contact)
         }
-    }))
+    })
+    return contactsToBook;
+}
+
+mongoManager.connect().then(r => {
+        filterAlreadyBookedContacts(contactList).then(listToBook => {
+            console.log(listToBook.length)
+            android.devices().then((devices) => {
+                let segmentNumber = listToBook.length / devices.length;
+                for (let i = 0; i < devices.length; i++) {
+                    startWithList(contactList.slice(i * segmentNumber, segmentNumber * (i + 1)), devices[i]);
+                }
+            })
+        })
+    }
+)
 
 // Connect to the device.
 
 async function needToBook(contact, mongoManager) {
-    let collectionName = formatDate(new Date())
-    let alreadBooked = await mongoManager.getAllSuccessfulItemsForDay(collectionName)
+    let alreadyBooked = await mongoManager.getAllSuccessfulItemsForDay(collectionName)
     let toReturn = true;
-    await alreadBooked.forEach((bookedItem) => {
+    await alreadyBooked.forEach((bookedItem) => {
             if (bookedItem.email === contact.mail) {
                 toReturn = false;
             }