This mainly goes out to Providers ... but please chime in if you have a thought to convey.
If (for example) a client contacts you on a Monday to prebook for 5:30pm the following Wednesday and you tell him that is perfect because you will be at you incall by 3:00pm ... what obligation do you feel in making that meet time as well?
If on the day of the meet, you determine you cannot make 5:30pm, what obligation do you feel in making it up to your client if ...
1) you let him know earlier that day?
2) you let him know that mid-afternoon?
3) you let him know at 6:30pm that day?