You should apologize to Dr. Jones and explain the situation. Together, discuss alternatives to transport Dr. Jones to his appointed destinations.
To avoid this situation, you must always include the ADA tagline in the position advertisement. Prepare in advance for accessibility issues by interviewing in accessible locations and considering the accessibility of your mode of transportation. Contact candidates in advance of their interviews and inform them who will be picking them up and what type of vehicle will be used. You may then ask if this will meet their needs.