gǎi tiān zài yuē yǒu shí shì lǐ mào huà, yě kě néng shì zhēn de xiǎng yǐ hòu zài yuē

“改天再约”有时是礼貌话，也可能是真的想以后再约。

'Let's meet another day' is sometimes a polite phrase, but it could also mean genuinely wanting to meet later.