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:       What's the matter with you ? You don't look well .  
 Person2:Nothing . Maybe it is just the weather . Rainy days often make me feel a little sad .  
 Person1:        Really ? I like rainy days . The moisture in the air is good for my skin .  
 Person2:Sure . But it is too cold today . I have to put on warm clothes and look stupid .  
 Person1:        Me , too . At this time of the year , I often miss my home in the warm south . 

formal