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:       Can you imagine a boat letting in the river ?  
 Person2:That would be terrible .  
 Person1:        Sure thing . I have an experience like that .  
 Person2:Oh , how were you saved finally ?  
 Person1:        I was in such a panic at that time . Fortunately another boat came along and I was saved from drowning . 

informal