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:       Oh , hi Pam . When did you get back from Canada ? How was it ? 
 Person2:The day before yesterday . I only visited Montreal and Ottawa , but I had a great time . 
 Person1:        Which city did you like better ? 
 Person2:That's hard to say ... I think Ottawa is prettier.It has better sightseeing , too . A lot of museums and galleries . 
 Person1:        And what's Montreal like ? What did you think of it ? 
 Person2:Montreal is more exciting . It has better shopping.The stores are cheaper and more interesting . 
 Person1:        Which one has better nightlife ? 
 Person2:Oh , Montreal of sure . It has more restaurants and clubs.They say Montreal is the most exciting city in Canada . 
 Person1:        Well , I've always wanted to see Vancouver . I've heard it has the most beautiful views . 

formal