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:       When ’ re you getting married ? 
 Person2:We planned our wedding for next May . 
 Person1:        Why so late ? Didn ’ t she want to get married this October ? 
 Person2:Yeah , I did . But my fiancee has an important project . 
 Person1:        That ’ s really a shame . By the way , who will be the bridesmaid ? 
 Person2:Julie ’ s friend , Mary . And John will be the best man . 
 Person1:        Wow ! I ’ m very excited about your ceremony . 

informal