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:       Hello , Mary . Why are you standing here in the cold wind ?  
 Person2:I ’ m waiting for a bus and going for a walk in the park .  
 Person1:        Going for a walk in such a cold weather ?  
 Person2:I always like to go for a walk before a supper .  
 Person1:        I see . 

formal