public async Task <Travel> Get(TravelId id) { try { ItemResponse <TravelDal> response = await this._container.ReadItemAsync <TravelDal>(id.ToString(), new PartitionKey(id.ToString())); var travelDal = response.Resource; return(TravelModelMapper.FromDalModel(travelDal)); } catch (CosmosException ex) when(ex.StatusCode == System.Net.HttpStatusCode.NotFound) { return(null); } }