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Im sure you got your system with her and you're a repeat customer but I would always reply with 'OK please book me for x pm'
and like the others say, do a check in at least 30 mins before for a double confirm - i.e. (some would say) an OTT level of confirmation for any SP:
'OK please book for 5.00 pm - 1 hour booking'
(4.00 pm) 'Just to confirm I will arrive at 5.00 pm for the appointment'
(4.30 pm) 'Hello, I am on my way to arrive at 5.00 pm for the appointment'
It seems daft but at the least you will be more likely to get your appointment, and early notification if its not happening or they double booked.
I assume these SP have a maid answering all or some of the time, eg if they on the job.
Sorry for your aborted punt.
Edit: I always assume the maid might be overrun with text messages or English is poor, however I am not in anyway condoning this mess about.