One can quibble about whether a salad ought to be offered or available, but it seems not important. On any service where there is a menu which is more than simply informational, e.g., one makes choices, it seems to me that one ought to indicate the items one wants.

More importantly, when something is missing, just ask. There is a call button. No hot towel, ask. Forgot to order a salad, it happens. Ask.