There should be a contact number for the company offering the deal. We haven't bought any that involved travel but we have had some hotel getaways. We are usually quite flexible when we can go so have always just bought it, phoned the number to book a date, printed off the voucher and off we go. I have noticed with the Pontins ones that are doing the rounds and there is a number to ring before you purchase, you check the date will be available, then you purchase, phone back and book it. I suspect you could do the same with the travel ones. Never had a problem with Groupon or the other companies.....