No easy way! Duplicates were driving me insane. And our patient population has two last names (hispanic) so if they say the other last name, then a new chart could be created.
One hack is train your staff to ask for the DOB when a patient calls. You can search by DOB in the patient list but this is not a default setting to have the DOB box shown.
The other thing we did is change the workflow on the new patient process so that only 1 person creates new patient charts (excluding newborns but these USUALLY don't result in duplicates).