A course booking SMS service with Firefox OS:

1. Customer sends: <name> <course_name> <course_time> <tickets>
2. System replies: Thank you <name>! Your booking (<tickets> tickets) for <course_name> at <course_time> is confirmed.

Implementation

navigator.mozMobileMessage.onreceived = (sms) => {
  let cust = sms.message.sender,
      [name, courseName, courseTime, tcktCnt] = sms.message.body.split(' '),
      msg = `Thank you ${name}! Your booking (${tcktCnt} tickets) for ${courseName} at ${courseTime} is confirmed.`;
  
  navigator.mozMobileMessage.send(cust, msg);
};

This was built at a hackathon - the easiest way to test is running the official SMS app in debug mode.