I've only had one.
No worries I said.
I simply deleted them from the round, if they ring back in spring and want to start again no problem but I won't chasing them or asking . As far as I'm concerned they are no longer a custy, if they want to be one again balls in their court. Out of sight out of mind.
I've found best thing to do with all non committal customers, I'll think about it, I'll ring you next time, I'll let you know, I'll be in touch when the gates fixed, I will be in touch in spring or I'll let you know when the garden finished. Any of these are a cancel and that's what I do, if they get in touch fine but we all know they rarely do.