One of my close friends has been on a first date, and the guy's asked her for a second. She isn't feeling it, but wrote to him saying 'Yeah that would be good, I've got a really busy week at work so I'll have to get back to you, but it would be cool."
It's up to her, but AIBU to think this is awful? She thinks it's kinder, but it's just wasting the guy's time. It's going to give him false hope and he'll likely message her again. Surely it's better to just politely decline.