How can I check value stored in a list when pressing button with the same name?

Something like this perhaps:

 int value = ga$$anonymous$$gTypes.Single(x => x.name == button.name).value;

Since you have provided no code, I can only guess as to what you have called your variables.

please post your code with your list so we can help

This is simple, yet the answer is not simple. You need to create the logic for this system to work, it's not some miraculously built-in thing just because you read it on a board game tutorial.

What I tend to do for displaying dialog is creating a class that is a dialog entry template, a dialog controller, and instantiate the dialogs as needed. So lets say your dialog entries can contain an activity, that would be included in the template class, then define it during instantiation. $$anonymous$$eep the activities separate. Like this. (this is a basic example mockup, don't expect it to work with copy and paste)

 public class DialogEntry : $$anonymous$$onoBehaviour
 {
     public Text text;
     public Activity activity;
     public void OnDialogSelected()
     {
         DialogController.Instance.RegisterSelection(this);
     }
 }

and

 public class DialogController : $$anonymous$$onoBehaviour
 {
     public static DialogController Instance
     {
         get
         {
             if (instance == null)
             {
                 instance = FindObjectOfType<DialogController>();
             }
             return instance;
         }
         private set
         {
             instance = value;
         }
     }
     private static DiaogController instance;
     public DialogEntry template;
     public RectTransform dialogAnchor;
     public void Initialize(Dialog dialog)
     {
         foreach (DialogActivityPair pair in dialog)
         {
             DialogEntry entry = Instantiate(template, dialogAnchor);
             entry.text.text = pair.text;
             entry.activity = pair.activity;
         }
     }
     public void RegisterSelection(DialogEntry entry)
     {
         if (entry.activity == someExpectedActivity)
         {
             //Do something based on expected activity.
         }
     }
 }