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 visitors from 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 traveling 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 fouth 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