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'm going to the store downtown this afternoon to try on my wedding dresses . 
 Person2:Oh my gosh , how exciting ! 
 Person1:        Will you come with me and help me choose ? 
 Person2:Sure , I will . How can I miss that ? 
 Person1:        Good . I think I'll get too nervous to look at myself in the mirror ! 
 Person2:Oh , don't . I'm sure you'll be the loveliest bride ever ! 

informal