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:       It's a fine day today , isn't it ?  
 Person2:Yes , it is.It ' s wonderful after the downpour .  
 Person1:        How nice seeing the sun back again ! The air is so fresh .  
 Person2:I hope it stays nice like this for a long period of time .  
 Person1:        Well , the weather is so unpredictable this time of year .  
 Person2:You're right.We don't know what is going to be like tomorrow .  
 Person1:        Look ! It looks as if it is going to rain .  
 Person2:The weatherman predicts a fine day today .  
 Person1:        The weather is often quite different from the weather forecast . 

informal