Lying could cause something bigger than things should be, telling the truth would make you look like a more honest and trustworthy person. A small lie always leads to something bigger, you may forget your lie or have to add on to the lie you have already said. Just tell the truth.
To keep that lie, you may need to tell another and go on like that... But even it is painful, one day truth will show its face outside and it may make you a liar regardless the efforts you took to make those people comfortable with small lies..