diff --git a/src/panels/config/automation/trigger/types/ha-automation-trigger-conversation.ts b/src/panels/config/automation/trigger/types/ha-automation-trigger-conversation.ts
index 34a03c9ace..aebc2a899e 100644
--- a/src/panels/config/automation/trigger/types/ha-automation-trigger-conversation.ts
+++ b/src/panels/config/automation/trigger/types/ha-automation-trigger-conversation.ts
@@ -10,6 +10,8 @@ import { showConfirmationDialog } from "../../../../../dialogs/generic/show-dial
 import { HomeAssistant } from "../../../../../types";
 import { TriggerElement } from "../ha-automation-trigger-row";
 
+const PATTERN = "^[^.。,，?¿？؟!！;；:：]+$";
+
 @customElement("ha-automation-trigger-conversation")
 export class HaConversationTrigger
   extends LitElement
@@ -39,6 +41,12 @@ export class HaConversationTrigger
                 iconTrailing
                 .index=${index}
                 .value=${option}
+                .validationMessage=${this.hass.localize(
+                  "ui.panel.config.automation.editor.triggers.type.conversation.no_punctuation"
+                )}
+                autoValidate
+                validateOnInitialRender
+                pattern=${PATTERN}
                 @change=${this._updateOption}
               >
                 <ha-icon-button
@@ -56,6 +64,11 @@ export class HaConversationTrigger
         .label=${this.hass.localize(
           "ui.panel.config.automation.editor.triggers.type.conversation.add_sentence"
         )}
+        .validationMessage=${this.hass.localize(
+          "ui.panel.config.automation.editor.triggers.type.conversation.no_punctuation"
+        )}
+        autoValidate
+        pattern=${PATTERN}
         @keydown=${this._handleKeyAdd}
         @change=${this._addOption}
       ></ha-textfield>`;
diff --git a/src/translations/en.json b/src/translations/en.json
index 042ec31ac6..567c33c6e3 100644
--- a/src/translations/en.json
+++ b/src/translations/en.json
@@ -2382,6 +2382,7 @@
                 },
                 "conversation": {
                   "label": "Sentence",
+                  "no_punctuation": "You should not use punctuation in your sentence",
                   "add_sentence": "Add sentence",
                   "delete": "Delete sentence",
                   "confirm_delete": "Are you sure you want to delete this sentence?",