Based on over 30 years in sales, being a sales trainer and having been through countless hours of sales training classes with many big name trainers, the number one technique that is underused by professionals is,...Ask them. "So, sounds like you really like the house? Shall I start the process toward writing an offer?"
If you ask you can get a Yes, No, or I need more information. "I want to think about it" is the most common response, to which you respond, "great, what resources can I provide you to help you with that? Do you want a CMA, information on the schools, proximity to transit..."
In real estate sales we are not on a car lot or electronics store where we need to force the issue. In fact, the harder you force, the more "no's" you'll get. This is a huge investment of money, life, energy etc. and buyer's need to know you have their interests first. We ask when it's appropriate and the signals are there, but if you push, shoe horn or use some fancy technique people will feel manipulated. If you are straight forward and are truly looking out for them, it's okay to ask for the business when they are ready and okay to let them think. Relational sales takes time and is not a wham, bam transaction.