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:       Haven't seen you for a long time  
 Person2:I've been away on a vacation .  
 Person1:        I bet you had a wonderful time  
 Person2:Yeah , beautiful sunshine , pleasant scenery and many new friends  
 Person1:        Sounds great 

informal