Sales Rep: "Hi, I'm (Your Name) What can I do for you?"
Sales rep: "excellent! what are we looking for?"
customer: "no seriously, I'm not buying today"
Sales rep: "that's okay, most people don't, most people come here to get information first, and I promise that the whole time i'm with you I wont ask you to buy anything, fair enough? shakes hand
I know what you're thinking....
If you tell them you won't ask them to buy today, how will you close the deal?
well, lets say you find exactly what they want, it meets all their needs and is affordable....
I would word track and say
"now Mr. customer, I know I told you I wouldn't ask you to buy anything today... pause... but if we could work out the details to 100% your satisfaction, is there any reason you wouldnt?
then shuttup and listen...