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:       Excuse me .  
 Person2:Yes ?  
 Person1:        How do I get to the Olympic Stadium , please ?  
 Person2:It ’ s not far . Go straight on then turn right at the end of the road .  
 Person1:        Thanks .  
 Person2:You ’ re welcome . 

informal