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 just dropped in to say goodbye .  
 Person2:What time are you leaving ?  
 Person1:        I'll leave at 10 o'clock .  
 Person2:Take care and give my best to you parents .  
 Person1:        Thank you , I will . Hope to see you again next year . 

informal