méi zhǎodào gòngtóngdiǎn shí, kěyǐ liáo dāngxià huánjìng: zhè jiā diàn, zhè tiáo duìwǔ, zhège tiānqì, zhè chǎng huódòng

没找到共同点时，可以聊当下环境：这家店、这条队伍、这个天气、这场活动。

When you can't find common ground, you can talk about the immediate environment: this shop, this line, this weather, or this event.