Marketing House under contract

[Dwight Walker Jr]

What if I have found a motivated seller, and I have the property under contract, and I begin to market the property to end buyers. Let's say I have the property on my website, Craigslist, and the newspaper. And it just so happens that the seller happens to see his/her property being advertise somewhere with the impression that I already currently have it under contract? How would I handle that situation if questioned by the seller?