Instructions: 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 a nice day ! Why don't we go for an outing ?  
 Person2:Sure.Where would you suggest ?  
 Person1:        How about going to the suburbs ?  
 Person2:Sounds good . 
Output:
informal