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:       Are you cold ?  
 Person2:Yes , a little .  
 Person1:        I wonder if we can change the temperature .  
 Person2:I tried before . There are no buttons on the air conditioning .  
 Person1:        There must be buttons . How do they turn it on and off ?  
 Person2:I think it is centrally controlled . They control it at the main desk .  
 Person1:        Well , they have it too cold in here . I want to be warmer . I won't be able to sleep .  
 Person2:I'm going downstairs for more drinking water . I will ask them .  
 Person1:        What did they say about the air conditioning ?  
 Person2:They said it is centrally controlled.All the rooms are the same . They can't change it .  
 Person1:        That's stupid . How can I sleep in this ?  
 Person2:You can wear more clothes . 

formal