yuēhuì hòu de dì-èr tiān, kěyǐ fā yī tiáo jiǎnduǎn xiāoxī: zuótiān xièxiè nǐ, wǒ liáo de hěn kāixīn

约会后的第二天，可以发一条简短消息：“昨天谢谢你，我聊得很开心。

The day after the date, you can send a short message: 'Thank you for yesterday, I had a great time chatting.'