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:       Well , how did you enjoy your seaside trip ?  
 Person2:It was fun , I tell you .  
 Person1:        Tell me about it , will you ?  
 Person2:Well , we drove through the valley on our way there in the morning . It was a magnificent sight !  
 Person1:        Did you stop at the Fall for some pictures ?  
 Person2:Sure , we wouldn't miss that for anything . After that , we took a short cut to the park . There was very little traffic , so we got there in less than an hour .  
 Person1:        You were lucky then .  
 Person2:Yeah , we spent the whole morning under the tall trees . We had our picnic there , too .  
 Person1:        What did you do after that ?  
 Person2:We went for a swim in the sea . That was the biggest part of the day . Just look at my nice tan !  
 Person1:        So you must have had a busy and enjoyable day yesterday .  
 Person2:Yes , you are right . And I was so tired out that I fell asleep on the way back . My muscles are still stiff from the swim yesterday . 

informal