Delete session entity type with the given entity type display name.

def delete_session_entity_type(project_id, session_id,
                               entity_type_display_name):
    """Delete session entity type with the given entity type display name."""
    import dialogflow_v2 as dialogflow
    session_entity_types_client = dialogflow.SessionEntityTypesClient()

    session_entity_type_name = (
        session_entity_types_client.session_entity_type_path(
            project_id, session_id, entity_type_display_name))

    session_entity_types_client.delete_session_entity_type(
        session_entity_type_name)