Attendees coming to your booth want to learn more about your company, and they will likely have lots of questions for you.
Just the same, you should have a healthy curiosity about them. Everybody that steps up could be a future, lucrative partner in business, so treat them that way.
Ask them who they are, what they want, and how you can work together.
Also, it’s useful to ask questions to determine if that person in front of you is a competitor who is fishing for information.
Request a business card. Sure, some people don’t bother with them, but spies most likely won’t have one, either. If they don’t have a business card, ask for their email address to follow up and see if it is the corporate email from the company they claim to represent.
Also, do they have their nametag stashed away or turned around? That could be a red flag that they are trying to hide their identity.
Show your booth visitors you are interested in who they are and at the same time chase off curious competitors.