It's not that code - read the error message:
unknown column 'information_service' in 'where clause' in C:\xampp\htdocs\user-page\user_interface\appointment.php:11
It can't find a column called
in your DB.
Since none of what you show us references
the problem is elsewhere in you code where we can't see it.
So start by looking at the file
and specifically at line number 11 - that's where the problem is being reported.