Green Gas interview questions

Got interviewed by the owner his very nice and respectful he asked me many question and tolled if I get hired I will be responsible to run the whole gas station and attend to customers

They have send me an email regarding the interview without confirming me about the interview telephonically. The interview was good and they were focusing on my technical knowledge & i have given them answers too but they are not satisfied with the responses. I was looking after the various activities in my previous company but they are bit demanding & need a specialized person.