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:       Hello Martin . Have you been to any events yet ?  
 Person2:Yes I have . I went to the table tennis yesterday .  
 Person1:        Oh wow . How was it ?  
 Person2:Oh . It was great . I love Ma Lin . He ’ s my favourite table tennis player . Have you seen anything yet ?  
 Person1:        Oh I still haven ’ t managed to get any tickets . I ’ d love to see something though .  
 Person2:Well , let ’ s go to the marathon tomorrow then ! We can just stand by the side of the road .  
 Person1:        What a great idea . 

informal