in order not to put vistors into an situation we should greet and introduce ourselves when first meeting with them offering a seat or drink can help break the ice.This maybe followed by talking about topics like the weather a trip or interests.Directions are often asked for as well.Last but not least,taking one's leave is also important.The conversation should be finished very politely and impressively.You may signal your leave by saying;for instances,May I be excused? or Do you mind if I leave you alone for a while? or I have some errands to run,but if you need any help I will be over there.