conversations-classic/src/main/res/layout/dialog_clear_history.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:paddingBottom="?attr/dialog_vertical_padding"
              android:paddingLeft="?attr/dialog_horizontal_padding"
              android:paddingRight="?attr/dialog_horizontal_padding"
              android:paddingTop="?attr/dialog_vertical_padding">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:text="@string/clear_histor_msg"
        android:textAppearance="@style/TextAppearance.Conversations.Body1"/>

    <CheckBox
        android:id="@+id/end_conversation_checkbox"
        style="@style/Widget.Conversations.CheckBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="@string/also_end_conversation"/>

</LinearLayout>