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:       Front desk , can I help you ?  
 Person2:Yes , I need a wake-up call tomorrow at seven thirty .  
 Person1:        Sure . Your room number , PLS ?  
 Person2:Room 1019 .  
 Person1:        Room 1019 , tomorrow at seven thirty . Ok , we will give you a call in the morning . 

formal