Nothing P's a customer off more than you not turning up when you say you will.
I picked up a new regular last week after I had a phone call from a grumpy person abusing me for not turning up.
I didn't have a clue who he was.
It turned out that I wasn't his lawnie, it was another fella all together!
Upshot was I said I'd come and do his lawn the next day. 900 sq.mtr block, flat and level. Whiz around with the ride on and whipper snip the edges. Done and dusted in no time.
Outcome was customer was happy and wants it done every two weeks. All because whoever he had failed to communicate.
Their loss, my gain.