Lady at work!!?

i'm 22 and single and work as a mechanic for a firm which deals with french cars... sometimes i have to talk direct with customers and try to explain what the problems are with there cars.. on 2 different ocions i have been talking and both the customers have said "fancy a shag"... yes for real like both women had been in there late 30z... and i replyed no they just winked and said "you no where we are if your up for it!" which i dont never see them before... so this morning i came to work and i see one of the women she winked again and said "you alright darling made your mind up"..... what do i do cause she will be back tomorrow at 5 to pick her car up! is this like a joke or is she for real... my work mates say she wants meat ! and are just like go on you dont have nothing to lose! help ???