Before I book a WG, I check her Likes and if I want to do one of the things she's listed on there, then when booking, I confirm - or try to - that it'll be on the menu when I turn up.
If it turns out that we didn't do something I'd asked for, I'd reflect that in my FR; but I wouldn't automatically downgrade the Headline grade because we didn't do something I asked for. It would depend on why we didn't do it; if I felt the WG was timewasting so as not to provide that particular service, for example, then that would lead me to move from Positive to Neutral or Negative.