indexassist.php

    <div role="main" class="ui-content jqm-content">
        <div class="form">
            <div class="bot-inbox inbox">
                <div class="icon">
                    <i class="fas fa-user"></i>
                </div>
                <div class="msg-header">
                    <p>Hello there, how can I help you?</p>
                </div>
            </div>
        </div>
        <div class="typing-field">
            <div class="input-data">
                <input id="data" type="text" placeholder="Type something here.." required>
                <button id="send-btn">Send</button>
                <button id="speak-btn">Speak</button>
            </div></div>
      
    

    <script>
        $(document).ready(function(){
            $("#send-btn").on("click", function(){
                $value = $("#data").val();
                $msg = '<div class="user-inbox inbox"><div class="msg-header"><p>'+ $value +'</p></div></div>';
                $(".form").append($msg);
                $("#data").val('');

                // start ajax code
                $.ajax({
                    url: 'message.php',
                    type: 'POST',
                    data: 'text='+$value,
                    success: function(result){
                        $replay = '<div class="bot-inbox inbox"><div class="icon"><i class="fas fa-user"></i></div><div class="msg-header"><p>'+ result +'</p></div></div>';
                        $(".form").append($replay);
                        // when chat goes down the scroll bar automatically comes to the bottom
                        $(".form").scrollTop($(".form")[0].scrollHeight);
                    }
                });
            });
        });
    </script>