Replying to Not sure what to do

Question guys...I have a pair of skis for sale, a guy offered me a  less that what i wanted for them, but...pretty hard up.  So i said yes, Seriously like 35 minutes later a guy calls me from 30 miles away and offers me cash what i am asking for them, as he says their sold out everywhere in the 185's.  I already told the other kid i would sell them to him, have tried to contact him several times...no avail...what do i do to be legit as i am new on here and don't wanna piss anyone off