Negotiating tactics

A - We'd like to “think about it”: What do you do with a procrastinator?

The reason people want to “think about it” ranges from classic procrastination to some fear or uncertainty they have (financing, location, space, etc.). Tell the buyers you understand how they feel, that buying a home is an "exciting" time.

Follow this up with, “Of course I should ask, do you have any questions?” This provides the opportunity for them to express their concerns. 

Now, plant the seed:

As they make their exit, tell them you hope to hear back from them. Then just a few seconds after you part, catch their attention with this as an afterthought, “I noticed how you were so at-home here. Since you really seemed to like our home, do you want me to call you if someone else makes an offer?”
 
No matter what their response is at that moment, the thought of losing your home to another buyer or of a potential bidding war will start sinking in. If they really liked your home, then the fact that they'd be paying more or losing your home altogether means that there's an excellent chance that you'll hear from them soon.