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:       Please do excuse me for a moment . I've got diarrhea .  
 Person2:It's easy to get loose bowels in summer .  
 Person1:        It may have something to do with the food I had last night  
 Person2:You ’ Ve got to be careful on the food you eat .  
 Person1:        I will . Thank you . 

informal