message.chat.id not working in Callback_query_handler

@bot.message_handler(commands=['start'])
def start_message(message):
    global user #tried making user,fn and Lname to be global variables
    global fn
    global Lname
    fn=message.chat.first_name
    Lname=message.chat.last_name
    user=str(fn)+' '+str(Lname)
    markup = telebot.types.InlineKeyboardMarkup()
    acct=telebot.types.InlineKeyboardButton(text='👤 Account', callback_data=1)
    ref=telebot.types.InlineKeyboardButton(text='👥 Referrals', callback_data=2)
    stats=telebot.types.InlineKeyboardButton(text='📈 Stats', callback_data=3)
    power=telebot.types.InlineKeyboardButton(text=' ⚡️ Buy Power',callback_data=4)
    payout=telebot.types.InlineKeyboardButton(text='💲 Payouts', callback_data=5)
    withdraw=telebot.types.InlineKeyboardButton(text='💵 Withdraw', callback_data=6)
    markup.row(acct)
    markup.row(ref,stats)
    markup.row(power,payout,withdraw)
    bot.send_message(message.chat.id, text="WELCOME"+user, reply_markup=markup) # user working here in the message handler but won't work in callback_query_handler

@bot.callback_query_handler(func=lambda call: True)
def query_handler(call):
    user=str(message.chat.first_name)+' '+str(message.chat.last_name)
    markup = telebot.types.InlineKeyboardMarkup()
    acct=telebot.types.InlineKeyboardButton(text='👤 Account', callback_data=1)
    ref=telebot.types.InlineKeyboardButton(text='👥 Referrals', callback_data=2)
    stats=telebot.types.InlineKeyboardButton(text='📈 Stats', callback_data=3)
    power=telebot.types.InlineKeyboardButton(text=' ⚡️ Buy Power',callback_data=4)
    payout=telebot.types.InlineKeyboardButton(text='💲 Payouts', callback_data=5)
    withdraw=telebot.types.InlineKeyboardButton(text='💵 Withdraw', callback_data=6)
    wallet=telebot.types.InlineKeyboardButton(text='🏦 Wallet', callback_data=7)
    email=telebot.types.InlineKeyboardButton(text='📧 Email', callback_data=8)
    bot.answer_callback_query(callback_query_id=call.id)
    if call.data == '1':
        markup.row(acct)
        markup.row(ref,stats)
        markup.row(wallet,email)
        markup.row(power,payout,withdraw)
        msg='👤 GENERAL INFORMATION\n\n◽ User: '+user+'\n◽ Balance: ' #so I wanted the bot to print the information of the bot user (First_name and last_name) but it's not working. It breaks the code and says user not defined.
        bot.send_message(call.message.chat.id,msg,reply_markup=markup)