Don't ask if you need to buy.
The next time you call or email him, you need to communicate the following matters:
1. Did you get your email (standard questions, necessary)?
2. Is the price in line with their budget (standard questions)
3. If the other party says there is a problem, make the necessary explanation and ask whether it is necessary to send another special plan.
4. If the other party says that they didn't receive it, you should resend it and confirm whether it was received the next day or later that day. Saying that you didn't receive the email is the usual refusal method of customers. The disadvantage is that you have been shirking, the advantage is that you can find opportunities to send the information to your door to talk to your customers. As long as you can visit in person, it is better than simple telephone and email communication.
5. Customers usually say "I'll have a look again". This is not a clear refusal. You should call him every once in a while and look for an opportunity to visit him.