Visiting Friends

Dear Helen,

I have some friends who visit Las Vegas every month from St. George. I keep inviting them to my home but they will come. How do I know that they really have other things to do and they don't have time or if they just feel embarrassed and don't want to say that they don't want to come visit. They always like us to come visit them in St. George(they are acupuncturists and always at their office-although I have visited their home before)