Phone Call: looking for tips to manage the first phone call

[William Boyce]

Hi, I am a newbie to Real Estate Investing. I have been doing my due diligences looking into direct mailing, finding lists, and so on...

I am now looking into the phone call part, thanks to show 77 on the awesome podcast, I was able to see important questions to ask on the phone and how to lead the conversation thanks to @Michael Quarles. One thing that I seem to not quiet understand is the part that if the sellers does not know how much he wants to sell his house for. Michael says that you should ask the sellers if they can do him a favor and do some research to estimate their house value and  get back to him in a few days once done. Michael seems to me to be one of the best at negotiating but on the other hand, I have heard from many other great investors that you should not let this potential lead somehow 'go away', because if one day pass by or maybe two that lead could have found another buyer... So my question is what do you think would be the best approach if you have a seller that is unable to estimate what its house is worth? 

Thank you a lot for your help guys

Have a great day