I sometimes tell little lies just to keep the conversation flowing.
この場合、次のような言い方ができますよ。
ーI sometimes tell little lies just to keep the conversation flowing.
「会話の流れを保つために、時々ちょっと嘘をつく」
to tell little lies「小さい嘘をつく」
to keep the conversation flowing で「会話の流れを保つ」
ご参考まで!