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 hear that the Students ' Union is going to take new members . 
 Person2:Really ? Can I join it ? 
 Person1:        Of course you can if you like it . 
 Person2:How can I join it ? 
 Person1:        There will be an information session about the Students ' Union this Tuesday . You can apply for it then . 
 Person2:OK , thank you . 

informal