Like dogs, some cats insist on sampling the meal being served. The cat may sit under the table and scratch at your leg and meow, or she may sit on the table beside your plate and be more forward about her desire. Unless your guest is 100% an animal person and finds this habit acceptable, the begging kitty should not be present during meal time.
There are also cats who beg for attention and are not content until they have it. Again, if your guest is a big fan of cats, have plenty of cat toys available and allow your cat to help you entertain. If your visitor would rather have conversation about topics other than your romping kitty, keep her elsewhere.