Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Flight BE407 to Rome is delayed . Will passengers please wait in the lounge .  
 Person2:Oh , How annoying !  
 Person1:        The time of departure will be announced as soon as possible .  
 Person2:It ’ s infuriating . I have to be in Rome by five . 

informal