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 today ?  
 Person2:It's fine today .  
 Person1:        What was the weather like yesterday ?  
 Person2:It rained all day yesterday . The weather was awful last week .  
 Person1:        What will the weather be like tomorrow ?  
 Person2:It's going to be sunny tomorrow . 

formal