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:       What's the weather forecast for today ? 
 Person2:Cloudy in the morning , overcast in the afternoon . 
 Person1:        Any rain ? 
 Person2:No , but I wouldn't be surprised if it rained tomorrow . 
 Person1:        I wouldn't either . It's been looking like rain for several days . 

formal