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:       Hi , is you , John ?  
 Person2:Oh , Jane . What on earth have you been ? I've called you a thousand times .  
 Person1:        Sorry , John . I suddenly got a severe stomachache last night , and stayed in hospital the whole day .  
 Person2:But I called your cell phone , and there was no answer .  
 Person1:        I know , I left it at home .  
 Person2:Do you feel better now ?  
 Person1:        It's OK now . Don't worry , John . 

formal