how to improve simple prolog login? -

i building first project in swi-prolog.it expert system guess user identification base on input of user. of code produces dialog allows user enter information, verifies information , allows user have access. there way improve code?

 % user facts enable user log in user(dac,dac11). user(dac101,daa).  % login gui. checks database log in logingui :- new(dialog,dialog('login')),           send_list(dialog, append,                   [                     new( username, text_item(username)),                     new(password, text_item(password)),                     button(enter, and(message(@prolog,                                checkuser,                               username?selection,                                password?selection),                                 message(dialog, destroy)                                ))]),                     send(dialog, default_button, enter),                     send(dialog, open).  % verfies user logging checkuser(username,password):-user(username,password),                                username \== password,                                new(dialog,dialog('login')),                   send_list(dialog, append,                   [                     new(  label(welcome_to_criminal_system,welcome_to_criminal_system)),                     button(enter, and(message(@prolog,                                ask_user),                                 message(dialog, destroy)                                ))]),                     send(dialog, default_button, enter),                     send(dialog, open).   % main menu loggin , user can search or select different option ask_user :-         new(dialog, dialog('main menu')),         all_offence(t),all_eye_color(e),all_skin_colour(skin),          all_hair_colour(hc) ,all_hair_style(hs),         send_list(dialog, append,                   [ new(n1, text_item(firstname)),                     new(n2, text_item(lastname)),                     new(n3, new(s, menu(gender))),                     new(n4, new(offense, menu(offense,cycle))),                     new(n5 , new(eye,menu(eye_color,cycle))),                     new(n6,  new(hair,menu(hair_color,cycle))),                     new(n8,  new(hairstyle,menu(hair_style,cycle))),                     new(n9, new(skincolor,menu(skin_color,cycle))),                     button(all_criminals,and(message(@prolog,                                                       all_criminals),                                                              message(dialog, destroy))),                     button(add_criminals,and(message(@prolog,add_criminal_gui), message(dialog, destroy))),                     button(exit, message(dialog, destroy)),                     button(enter, and(message(@prolog,                                               pick_search_algorithm,                                               n1?selection,                                               n2?selection,                                               n3?selection,                                               n4?selection,                                               n5?selection,                                               n6?selection,                                               n8?selection,                                               n9?selection),                                       message(dialog, destroy)))                   ]),         send_list(offense, append,t),         send_list(eye, append,e),         send_list(hair, append,hc),         send_list(hairstyle, append,hs),         send_list(skincolor, append,skin),         send_list(s, append,  [male, female,none]),         send(dialog, default_button, enter),         send(dialog, open).