Updateed some formatting and bug fixes

Fixed inconsistencies in queries that would result in errors because
the parameters were missing. Updating a guest is an example that had
this issue. After checking parameters should all be supplied where
needed.

OpheliasOasis/Program.cs

@@ -576,6 +576,19 @@ internal class Program
                 Console.WriteLine("You currently do not have an active registration.");
                 return;
             }
+            if (activeReservation.StartDate.Date < DateTime.Now.Date && activeReservation.CheckIn == null)
+            {
+                Console.WriteLine("Your reservation is no longer valid, it has been cancelled. You may be charged based on your reservation type.");
+                activeReservation.CancelReservation();
+                activeReservation = null;
+                return;
+            }
+            if (activeReservation.CheckIn != null)
+            {
+                Console.WriteLine("You can't update a reservation that has been checked in.");
+                return;
+            }
+
 
             Console.Write("Your current reservation details are:\n" +
                 $"\tStarts on: {activeReservation.StartDate.ToString("yyyy-MM-dd")}\n" +
@@ -711,6 +724,7 @@ internal class Program
                     }
                     activeReservation.CancelReservation();
                     Console.WriteLine("Your reservation has been cancelled because you failed to pay within the payment period.");
+                    activeReservation = null;
                     return;
                 }
             }