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:       Which way is the dining car ?  
 Person2:Two cars forward .  
 Person1:        What time will breakfast be served ?  
 Person2:7:00 , sir . 

formal