code: public Observable<ComapiResult<Void>> deleteConversation(@NonNull final String conversationId, final String eTag) {
  
          final String token = getToken();
  
          if (sessionController.isCreatingSession()) {
              return getTaskQueue().queueDeleteConversation(conversationId, eTag);
          } else if (TextUtils.isEmpty(token)) {
              return Observable.error(getSessionStateErrorDescription());
          } else {
              return doDeleteConversation(token, conversationId, eTag);
          }
      }
docs: Returns observable to create a conversation.
  
  @param conversationId ID of a conversation to delete.
  @param eTag           ETag for server to check if local version of the data is the same as the one the server side.
  @return Observable to to create a conversation.