There is no problem in any form of pleasant behavior (smiling, initiating conversation) as long as it is not meant to attract attention, the same goes for the ornamentation or perfuming. Softening of the voice usually applies when a woman is reciting something (e.g. religious poetry), it is not a criteria for ordinary speech.
If the actions I described above are overt and become a source of getting the attention or sinful thoughts then it must be avoided. But, in a professional atmosphere this should not be a problem with proper Islamic decorum.
It is permissible to give the tour if proper Islamic etiquette is observed and saying salam first is actually recommended