Going on holiday

CAROL:Hello, Sam. Come in.
TOM:Hi, Sam. We're having lunch. Do you want to have lunch with us?
SAM:No, thank you, Tom. I've already had lunch. I had lunch at half past twelve.
CAROL:Have a cup of coffee then.
SAM:I've just had a cup, thank you. I had one after my lunch.
TOM:Let's go into the living room, Carol. We can have our coffee there.
CAROL:Excuse the mess, Sam. This room's very untidy. We're packing our suitcases. We're going to leave tomorrow. Tom and I are going to have a holiday.
SAM:Aren't you lucky!
TOM:When are you going to have a holiday, Sam?
SAM:I don't know. I've already had my holiday this year.
CAROL:Where did you go?
SAM:I stayed at home!