How To get the Display Name of field when we fetch the "AuditDetailCollection" of opportunity entity.

How To get the  Display Name of field  when we fetch the  "AuditDetailCollection" of opportunity entity.

This is my code:--

RetrieveRecordChangeHistoryRequest changeRequest = new RetrieveRecordChangeHistoryRequest();
changeRequest.Target = new EntityReference("opportunity", opportuntiyid);
RetrieveRecordChangeHistoryResponse changeResponse = (RetrieveRecordChangeHistoryResponse)service.Execute(changeRequest);
AuditDetailCollection details = changeResponse.AuditDetailCollection;