Although Oliver thought it would be very good not to be seeing the Healer - again - he nevertheless shook hands and exchanged a pleasant, 'Hello,' in response. He even went so far as to politely stand and waited until the healer had taken his chair to resume sitting.
He didn't have anything to say at the moment, and thus left the talking up to Verity, trusting that as a woman, she would know better what to open the discussion with than himself.