diff --git a/data.py b/data.py
new file mode 100644
index 0000000..7bb10dd
--- /dev/null
+++ b/data.py
@@ -0,0 +1,51 @@
+import csv
+
+operators_and_users = {
+    # operator
+    ("06", "Krzysztof Bojakowski"): [
+        # users
+        ("01", "Mikołaj Gawron"),
+        ("05", "Patryk Osiński"),
+        ("09", "Bartosz Wieczorek"),
+        ("07", "Sergiusz Kański"),
+        ("03", "Dawid Korzępa"),
+    ]
+}
+
+OP_ANON = "system"
+USER_ANON = "user"
+
+for operator, users in operators_and_users.items():
+    op_id, op_name = operator
+    for (user_id, user_name) in users:
+        with open(f"./data/dialog-{op_id}-{user_id}-01.tsv", "w", newline='\n', encoding="utf-8") as csvfile:
+            spamwriter = csv.writer(csvfile, delimiter='\t', quotechar='|', quoting=csv.QUOTE_MINIMAL)
+            spamwriter.writerow(["kto", "treść"])
+            with open(f"./data/raw/dialog-{op_id}-{user_id}-01.txt", "r", encoding="utf-8") as f:
+                whos_typing = None
+                text = ""
+                while True:
+                    line = f.readline().strip()
+                    if not line: # eof
+                        break
+
+                    if user_name not in line and op_name not in line:
+                        if text != "":
+                            text += f"\\n{line}"
+                        else:
+                            text = line
+
+                    if user_name in line:
+                        if text != "" and whos_typing != USER_ANON:
+                            spamwriter.writerow([whos_typing, f"'{text}'"])
+                            text = ""
+                        whos_typing = USER_ANON
+
+                    if op_name in line:
+                        if text != "" and whos_typing != OP_ANON:
+                            spamwriter.writerow([whos_typing, f"'{text}'"])
+                            text = ""
+                        whos_typing = OP_ANON
+
+                if text != "":
+                    spamwriter.writerow([whos_typing, f"'{text}'"])