Improvisational theater carries several principles that travel agents can use to enhance their sales skills, business author Daniel Pink says. Travel agents also can boost business by touting qualities they have that travelers can't find online -- such as expert advice, Pink says. "What I hear over and over again in a whole range of industries is that there is a whole new premium value on expertise. It's essential. The idea of simply trying to get customers to have you do simple routine transactions on their behalf isn't that viable anymore," Pink said.