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:       Hey Lucas , how was your trip to Paris ?  
 Person2:It was wonderful , but I was so tired .  
 Person1:        Did you go to the top of the Eiffel Tower .  
 Person2:Yes , that was the first thing we did . We went all the way to the top . There were visitorsfrom all over the world taking photos there .  
 Person1:        What else did you see ?  
 Person2:Art galleries , cathedrals , statues , fountains , palaces , bistros , there's really too much to say .  
 Person1:        You must have had a great time .  
 Person2:Yes , at the beginning we were all excited and had lots of fun . However , on the third day of travelling in the city , I felt sick I think I had something bad to eat but it passed by the evening .  
 Person1:        Yes . you need to be careful with what you eat when you're abroad.sometimes new food might disagree with you .  
 Person2:On the fourth day , we went to taste the French cuisine . That was really fantastic . And no stomach problems .  
 Person1:        That is great . Everyone says French food is wonderful .  
 Person2:You'll have to try for yourself some day . 

informal