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:       I am sorry to hear that you are not feeling well . How are you ?  
 Person2:Thank you . I was operated on for gastric ulcer .  
 Person1:        Is that so ? But I think It shouldn't keep you long in bed .  
 Person2:Yes . I hope so . 

informal