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:       Darling , this dress is for you . I hope you like it .  
 Person2:Oh , very beautiful . Thank you , Steven , I like it very much .  
 Person1:        Your birthday is coming , and I think this dress suits you . Why not try it now ?  
 Person2:My birthday present ? I can't help telling you that I am a happy woman , darling . I will come back soon . ( Go to her bedroom and wear the new dress , then show it to Steven . )  
 Person1:        It fits me exactly . How does it look like ?  
 Person2:It displays your slender figure , darling .  
 Person1:        The most important thing is that you bought it for me . I am happy that you know my size and style .  
 Person2:Because you are my dear wife . 

informal