Dialogue.cs

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;

public class Dialogue : MonoBehaviour {
  public static bool isOpen = false;
  public static Dialogue Instance;
  public static float timeClosed;

  [Header("Configuration")]
  public KeyCode keyToClose = KeyCode.Space;

  [Header("Initialization")]
  public Text text;
  public Animator animator;

  public static void Open (string message) {
    Instance.text.text = message;
    isOpen = true;
  }

  void Awake () {
    Instance = this;
  }

  void Update () {
    if (isOpen && Input.GetKeyDown(keyToClose)) {
      isOpen = false;
      timeClosed = Time.time;
    }

    animator.SetBool("is open", isOpen);
  }
}