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 looks like it's going to be sunny .  
 Person2:Yes , it's much better than yesterday .  
 Person1:        They say we're going to get some rain later .  
 Person2:Oh , let's just hope it stays warm . 

informal