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:       How about a movie tonight ?  
 Person2:It doesn ’ t matter to me .  
 Person1:        Does 7 o'clock suit you ?  
 Person2:Either way . I don ’ t care .  
 Person1:        How about a snack after work ?  
 Person2:I couldn ’ t careless .  
 Person1:        Would you rather stay home ?  
 Person2:Whatever you say .  
 Person1:        Are you really interested in doing something ?  
 Person2:I don ’ t mind if you want to . 

formal