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:       Are you feeling OK ?  
 Person2:My stomach is bothering me .  
 Person1:        What have you been eating ?  
 Person2:I had a ham sandwich with mayonnaise for lunch .  
 Person1:        Maybe the food had something wrong with it .  
 Person2:It could be bad food , but I didn ’ t feel so well yesterday , either .  
 Person1:        Have you been under a lot of pressure lately ?  
 Person2:I haven ’ t been under any more stress than usual .  
 Person1:        Perhaps you have caught that bug that is going around .  
 Person2:I feel like maybe I am coming down with the flu . 

informal