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:       Did you see Ally Mabel last night ? 
 Person2:Yes , I did . Did you ? 
 Person1:        Yes , wasn't it funny ? 
 Person2:Oh yes , I loved it . Wasn't the scene with the judge great ? 
 Person1:        Ha , yes , brilliant ! 

informal