updating a name or email at time of booking new appointment

I used to add the number of the meeting after their name updating it each booking, so on Outlook could see quickly what appt it was; since the update this no longer works. Unless I re-register the client, they now for ever see that their appointment is eg: appointment 2 even as I cannot alter what the system has 'collected' as the latest name and email link. I am really missing the ability to update a name or email at the time of making a booking. Can you bring this back?