Give them full attention, looking them in the eye for the first 60 sec. Gradually shift to multitasking while talking after that, until they are eventually talking to the side of your head while you are looking only at your screen typing feverishly, maybe with a drawer/file cabinet rummage or two in the process. Lather, rinse, repeat as necessary.
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)