Bash: Yes/No Confirm script

simple_yes_no_confirm.sh

#!/bin/bash
# Author: Nghia Le <trongnghia203@gmail.com>
# Description:
#   - To ask user if they're sure and wanted to run this bash script as current log-in user

echo -e "\n"
read -n 1 -p "Do you want to run this bash script as $(whoami)? Yes/[No]: " YES_NO
echo -e "\n"
if [ -z ${YES_NO} ] || [ ${YES_NO} = "No" ] ||  [ ${YES_NO} = "no" ] ||  [ ${YES_NO} = "N" ] ||  [ ${YES_NO} = "n" ]; then
    echo -e "\nYou select No, then it is going to exit now... "
    sleep 1
    echo -e "\nGood bye now..!!!\n"
    sleep 1
    exit 1
elif [ ${YES_NO} = "Yes" ] ||  [ ${YES_NO} = "yes" ] ||  [ ${YES_NO} = "Y" ] ||  [ ${YES_NO} = "y" ]; then
    echo -e "\nHmmmm, hummm..."
    sleep 2
    echo -e "\nOkey, then it is going to run the bash script now... after 5 seconds"
    sleep 3
    echo -e "\n2 seconds now..."
    sleep 2
    echo -e "\nDeploying...\n"
else
    echo -e "\nWrong input!!!"
    sleep 1
    echo -e "\nGood bye now..!!!\n"
    sleep 1
    exit 1
fi