Based on the tweet "@camairco Increased flights from 70 - 100 without increasing your fleet=Significant delays since the beginning of this month. #disappointing", categorize the level of sadness felt by the author. Select from the following: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.