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:       Welcome back ! How was your vacation ?  
 Person2:It was fantastic , but I'm glad to be back ! Being a tourist is really tiring !  
 Person1:        Where did you end up going ?  
 Person2:Because it's off-season , we got a really good package deal to Paris , so we went there .  
 Person1:        I've always wanted to go to Paris . The Eiffel Tower is one of the most famous tourist attractions in the world ! Did you go to the top ?  
 Person2:That was the first thing we did . I have a few pictures . Do you want to see them ?  
 Person1:        Sure . What's this one a picture of ?  
 Person2:Oh , that's a picture of me on our fourth day of travelling . I'm standing next to a famous foundation in the centre of the city .  
 Person1:        You don't look very happy in that picture .  
 Person2:No , by that time , I was sick of sightseeing . I had had enough of art galleries , cathedrals , fountains , statues , and palaces !  
 Person1:        So what did you do ?  
 Person2:We spent that afternoon walking around a flea market . We had a few coffees , watched a movie , and went for a swim in the pool at the hotel .  
 Person1:        My travel agent always reminds me to plan a day of relaxing for every 3 days of sightseeing . Did you go to the Louvre ?  
 Person2:Of course ! You can't go to Paris without going to their famous art gallery ! I was surprised by how small the Mona Lisa was though .  
 Person1:        That's what everyone says ! I can't wait to see it for myself some day . 

informal