async def METHOD_NAME(update, context):
    """Bot introduction. Allow to receive alerts after this first meeting"""
    consultant = await check_user_is_declared(update, context)
    if consultant is None:
        return ConversationHandler.END
    user = update.message.from_user
    if consultant.telegram_id:
        await update.message.reply_text(_("very happy to see you again !"))
    else:
        consultant.telegram_id = user.id
        await db_sync_to_async(consultant.save)()
        await update.message.reply_text(_("I very pleased to meet you !"))
    return ConversationHandler.END