If you're booking an appointment and have the ability to chose the time, pick a time slot right after their lunch break.
I've always used this technique and it never fails. When they have clients one after another, they can interfere with your negotiations. A bad taste from a conversation that just happened can seep into your negotiation.
A research conducted by Cornell University reported that people feel a greater sense of entitlement when they are hungry vs. when they are not.
At lunch, people are more relaxed and may be more open to discussion and negotiation. In the post-prandial period after lunch, we feel sleepy as our digestive systems have more need for blood than our brains. This less alert may be a period when we are susceptible to suggestion (or maybe just not interested in negotiation).
When people eat during competitive negotiations, they find better deals, according to a forthcoming study from Stanford's Graduate School of Business.
Food induces positive feelings towards one self and that flows to the matter under discussion says Andrew Lloyd.
Andrew Lloyd Beaver PA says to check their booking calendar for a lull in appointment times around lunch. This break in time is most likely when they are going to lunch. Another strategy is ask if they are available at noon and more likely then not they will say they will not be back from lunch until X time.
Moral of the story: If you don't want to leave money on the table, try negotiating after a meal.