Hi RosW,
Welcome to the world of travelling solo.
I'm so sorry to hear that you have been unable to book your trip with us.
Sadly not all tours and dates are available from all airports. I could see in our system that we originally had Exeter for the 24th September, but not the 30th September. There may be a number of reasons for this, for example; we were unable to secure seats or perhaps the flight times have changed.
As an added complication, we have to return all unsold flight seats back to the airlines a number of weeks before departure. Where possible, when a new traveller wants to book on one of the dates where we have returned seats, we do try to buy them back. Sometimes we are able to do this, and on occasion we are unsuccessful.
I promise, we don't enjoy disappointing travellers and are team of holiday creators (and aviation executives) are always looking at new opportunities that will enable travellers to fly from their local airport.
Kindest regards,
Julia