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:       Susan has got the cancer of stomach . 
 Person2:How terrible ! This is quite unexpected ! 
 Person1:        Yesterday when I went to hospital to see her , you cannot imagine how greatly surprised when I saw her . 
 Person2:What happened ? 
 Person1:        Because of atomic cocktail and other medicines , all of them have the side effect . she has lost all her hair . 

informal