added user class and a database class and did required changes in LoginForm. COmmented(landing page)

Author: ishaanj0412

lib/bookingdetails.dart

@@ -56,7 +56,6 @@ class BookingDetails extends StatelessWidget{
   List<String> carpools = ["Ishaan Jalan", "Rudransh Dixit", "hewwo", "manda", "ramesh", "mukesh", "sukesh", "nilesh"];
 
 
-
   @override
   Widget build(BuildContext context) {
     avlblcarpools();
@@ -106,7 +105,48 @@ class BookingDetails extends StatelessWidget{
       backgroundColor: Colors.black,
       floatingActionButton: FloatingActionButton(
         heroTag: "button2",
-        onPressed: (){},
+        onPressed: (){
+            Navigator.push(context, MaterialPageRoute(builder: (context) => AlertDialog(
+            backgroundColor: Color(0xFF212121),
+            shape: RoundedRectangleBorder(
+              borderRadius: BorderRadius.circular(14),
+            ),
+            title: const Center(
+                child: Text(
+                  'Cancel Booking',
+                  style: TextStyle(color: Colors.white, fontSize: 18),
+              ),
+            ),// To display the title it is optional
+            content: const Text(
+                'Are you sure you want to cancel the booking?',
+              style: TextStyle(color: Colors.white),
+            ),   // Message which will be pop up on the screen
+            // Action widget which will provide the user to acknowledge the choice
+            actions: [
+              TextButton(           // FlatButton widget is used to make a text to work like a button
+                onPressed: () {
+                  Navigator.pop(context);
+                  Navigator.pop(context);
+                },        // function used to perform after pressing the button
+                child: const Text(
+                    'YES',
+                    style: TextStyle(color: Colors.red),
+                  ),
+              ),
+              TextButton(
+                onPressed: () {
+                Navigator.pop(context);
+              },
+                child: const Text(
+                        'NO',
+                        style: TextStyle(color: Colors.green),
+                    ),
+              ),
+            ],
+          ),
+          ),
+            );
+        },
         backgroundColor: Colors.red,
         child: const Icon(
           Icons.delete,