i want to sendemail php code for the following html section

Question

1)appointment.html section

<section id="service-single-area">
<div class="container">
<div class="row">
<div class="col-lg-9 col-md-8 col-sm-12 col-xs-12 pull-right">
<div class="service-single-content">
<div class="appoinment-form">
<div class="title">
<h2>Make an Appoinment</h2>
</div>
<form id="appoinmentone" name="appointment" action="sendmail.php" method="post" enctype="text/plain" >
<div class="row">
<div class="col-md-6">
<input type="text" name="name" value="" placeholder="Your Name*"
required="" id="name">
<input type="email" name="email" value="" placeholder="Your Mail*"
required="" id="email">
<input type="text" name="phn" value="" placeholder="Phone Number*"
required="" id="phone">
<input type="date" name="date" value="" placeholder="Apointment Date*"
required="" id="date">

</div>
<div class="col-md-6">
<select class="selectmenu" >
<option selected="selected" id="prod" name="services">Select Service</option>
<option id="prod">Commercial Aquaguard</option>
<option id="prod">Industrial RO Plants</option>
<option id="prod">Water Cooler</option>
<option >Commercial Vacuum Cleaner</option>
<option>Water Ionizers</option>
</select>
<textarea name="message" placeholder="Your Message.."
required="" id="messsage"></textarea>
</div>
</div>
<div class="row">
<div class="col-md-12">
<form method="post">
<button class="thm-btn bg-1" type="submit" onclick="document.getElementById('appoinmentone').submit();">Submit Now</button>
</form>
</div>
</div>
</form>
</div>

</div>
</div>
</div>
</div>
</section>

2)here the refer php code for sending mail this is not for that appointment section its only for example purpose. i want to build same php code for that particular html section that i have given.

<?php
if (isset($_POST['email']))
{
// EDIT THE 2 LINES BELOW AS REQUIRED
$email_to = "[email protected]";
$email_subject = "Booking Received";
function died($error)
{
// your error code can go here
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
echo "These errors appear below.<br /><br />";
echo $error . "<br /><br />";
echo "Please go back and fix these errors.<br /><br />";
die();
}
// validation expected data exists
if (!isset($_POST['name']) || !isset($_POST['email']) || !isset($_POST['telephone']) || !isset($_POST['comments']))
{
died('We are sorry, but there appears to be a problem with the form you submitted.');
}
$name = $_POST['name']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['telephone']; // not required
$comments = $_POST['comments']; // required
$checkin = $_POST['SelectedDate1']; // required
$checkout = $_POST['SelectedDate2']; // required
$Place = $_POST['Place']; // required
$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
if (!preg_match($email_exp, $email_from))
{
$error_message .= 'The Email Address you entered does not appear to be valid.<br />';
}
$string_exp = "/^[A-Za-z .'-]+$/";
if (!preg_match($string_exp, $name))
{
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if (strlen($comments) < 2)
{
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
}
if (strlen($error_message) > 0)
{
died($error_message);
}
$email_message = "Form details below.\n\n";
function clean_string($string)
{
$bad = array(
"content-type",
"bcc:",
"to:",
"cc:",
"href"
);
return str_replace($bad, "", $string);
}
$email_message .= "First Name: " . clean_string($name) . "\n";
$email_message .= "Email: " . clean_string($email_from) . "\n";
$email_message .= "Telephone: " . clean_string($telephone) . "\n";
$email_message .= "Comments: " . clean_string($comments) . "\n";
$body = "Mail Send";
$msg = 'Name:-' . $_POST['name'] . "\n" . 'Email:-' . $_POST['email'] . "\n" . 'Contact No:-' . $_POST['telephone'] . "\n" . 'Check In:-' . $_POST['SelectedDate1'] . "\n" . 'Check Out:-' . $_POST['SelectedDate2'] . "\n" . 'Place:-' . $_POST['Place'] . "\n" . 'cOMMENTS:-' . $_POST['comments'];
mail($email_to, $email_subject, $msg);
echo '<span style="color:#FFFFFF">Your E-mail has been sent !Thank you for contacting us. We will be in touch with you very soon.</span>';
?>
<!-- include your own success html here
if($send_email)
{
echo "Your E-mail has been sent !Thank you for contacting us. We will be in touch with you very soon.";
}
else
{
echo "E-mail sent was failed !";
} -->
<?php
}
?>

pls suggest me. the php code for that with a specific email format the fields are name, mobile, address, date, services, message etc. it displays into the email