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:       Did you listen to the weather forecast ? 
 Person2:No.Why ? 
 Person1:        There ’ s a typhoon coming . 
 Person2:No way ! 
 Person1:        Yep , it should be here by tomorrow night . 

informal