Let conversation develop
Begin with an ordinary topic and leave room for the guest's response. You do not need to fill every silence or discuss your private life. Listening before changing the subject usually works better than delivering a sequence of rehearsed questions.
Avoid mixed messages
Keep professional friendliness separate from promises about private contact. You can decline requests for your personal accounts or meetings outside work. When a question concerns venue prices or availability, refer it to the right person rather than improvising to maintain attention.
Know when to stop
If a topic becomes offensive or a request continues after you have declined, you do not have to keep talking out of politeness. Step away and involve the supervisor when needed. Establish the support procedure beforehand so that boundaries are practical rather than something you must defend alone.