Getting chatbot’s last message

function start_ticket_thread($reply, $query)

{

    // First we'll check if the user is asking to create a ticket.

    $last_message = $query->get_message();

    $expected_question = 'Create a ticket to support.';

    if ($last_message == $expected_question) {

        $reply->set_reply('Please start the reply with (NEW_TICKET) followed by the subject title, subject type (general/technical) and a description.');

    }

    return $reply;

}

add_filter('mwai_ai_reply', 'new_ticket_reply', 10, 2);

Hello I have this code to set a custom reply to a user when he wants to send a ticket to support using the chatbot and I want to make another filter which checks whether the last message returned by the chatbot is “Please start the reply with (NEW_TICKET) followed by the subject title, subject type (general/technical) and a description.”, may I know how do I do this?