Parameter error, SQLSTATE[HY093]: Invalid parameter number: parameter was not defined - php

Question

So I'm getting SQLSTATE[HY093]: Invalid parameter number: parameter was not defined, when I try to submit my form. I have a reservations folder with a index.php file that has an include file as reservations.html.php which has the forms in html.
So my forms in the reservations.html.php when filled out and has a value in first name will then try to post all the values in the form into the reservations table I have created in mysql. Below are my code in the index.php
<?php
// Edit or Replace this try/catch statement to work with the current PHT configuration
include '../includes/db.inc.php';
// Modify the If statement so the try only runs if the First Name field has been submitted AND the honeypot field is empty ''
if (isset($_POST['myfname'])) {
$myFName = $_POST['myfname'];
$myTour = $_POST['tour'];
$myLName = $_POST['mylname'];
$myEmail = $_POST['myemail'];
// If the if statement is true, save each form field value as a variable. These variable values will be used in the thank you page.
// And run the try/catch to attempt to insert data in the database. Modify the INSERT statement to write all the form filed values (except the honeypot) to the database.
try
{
$sql = 'INSERT INTO reservations SET
tour = :tour,
fname = :fname,
lname = :lname,
email = :email';
$s = $pdo->prepare($sql);
$s->bindValue(':tour', $myTour);
$s->bindValue(':myfname', $myFName);
$s->bindValue(':mylname', $myLName);
$s->bindValue(':myemail', $myEmail);
$s->execute();
}
catch (PDOException $e)
{
$error = 'Error adding submitted joke: ' . $e->getMessage();
include '../includes/error.html.php';
exit();
}
// load the thank you page after the INSERT runs
include 'success.html.php';
// Add an else to load the initial page if the initial (line 19) if statement is false
} else {
include 'reservations.html.php'; //Modify this to include the initial file for this folder
}

Answer 1

The syntax for your insert statement is off, and appears to be hybrid between an insert and an update. Try this version:
$sql = "INSERT INTO reservations (tour, fname, lname, email) ";
$sql .= "VALUES (:tour, :fname, :lname, :email)";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':tour', $myTour, PDO::PARAM_STR);
$stmt->bindParam(':fname', $myFName, PDO::PARAM_STR);
$stmt->bindParam(':lname', $myLName, PDO::PARAM_STR);
$stmt->bindParam(':email', $myEmail, PDO::PARAM_STR);
$stmt->execute();
$stmt->close();
To be clear here, a SQL insert statement takes the following things:
The INSERT INTO keywords, followed by a list of columns
Then a VALUES clause, followed by a tuple containing the values to be inserted
There is also an INSERT INTO ... SELECT, which uses a select statement to provide the values, but you are not using this form.