<form name="bookingForm" class="quote">
              <div class="form-group">
                <input
                  required
                  type="text"
                  name="firstName"
                  id="id"
                  class="form-control"
                  placeholder="First Name"
                />
              </div>
              <br />
              <div class="form-group">
                <input
                  required
                  type="text"
                  name="lastName"
                  id="id"
                  class="form-control"
                  placeholder="Last Name"
                />
              </div>
              <br />
              <div class="form-group">
                <input
                  required
                  type="tel"
                  name="phoneNumber"
                  id="id"
                  class="form-control"
                  placeholder="Phone number"
                />
              </div>
              <br />
              <div class="form-group">
                <input
                  required
                  type="datetime-local"
                  name="date"
                  id="id"
                  class="form-control"
                  placeholder="Pick a date & time"
                />
                <p>Note: Wednesdays are not available</p>
              </div>
              <div class="form-group">
                <input
                  required
                  type="text"
                  name="postcode"
                  id="id"
                  class="form-control"
                  placeholder="Postcode"
                />
              </div>
              <br />
              <div class="form-group">
                <input
                  required
                  type="text"
                  name="service"
                  id="id"
                  class="form-control"
                  placeholder="Service (Basic or Extended)"
                />
              </div>
              <br />
              <button class="button__1" onclick="validation();">Book</button>
            </form>
          </div>
        </aside>
      </div>
    </section>
    <br />
    <br />
    <br />
    <footer id="footerServices">
      <p>John Kerr Driving Lessons 2019, Tel: 07986012116</p>
    </footer>

    <script>
      function validation() {
        event.preventDefault();
        var x = document.forms["bookingForm"].elements["id"].value;
        if (x == "") {
          alert("Ensure all fileds are filled");
          return false;
        } else {
          sendSMS();
          alert("Success");
          return true;
        }
      }
    </script>
    <script>
      function sendSMS(
        firstName,
        lastName,
        phoneNumber,
        date,
        postcode,
        service
      ) {
        const accountSid = process.env.TWILIO_ACCOUNT_SID;
        const authToken = process.env.TWILIO_AUTH_TOKEN;

        const client = require("twilio")(accountSid, authToken);

        client.messages
          .create({
            to: process.env.MY_PHONE_NUMBER,
            from: "+12055123395",
            body: firstName,
            " ": lastName,
            " would like to book a test on ": date,
            " their number is ": phoneNumber,
            " their address is ": postcode,
            " the service they would like is ": service
          })
          .then(message => console.log(message.sid));
      }
    </script>