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 racing fans ! My name is Rick Fields and , as always , I am joined by my partner in crime , Bob Copeland . 
 Person2:We ’ re in the last stretch of this very exciting race , and Kimmi Rikknen is leading the pack with only four laps to go ! They are heading to turn three and Lewis Hamilton tries to pass Rikknen ! It ’ s a close one and , oh no ! Hamilton hits the wall ! 
 Person1:        He came in too fast , jammed on the breaks and spun out . We have a yellow flag and the pace car is making its way onto the track . 
 Person2:The cleanup crew is towing the heavily damaged car and the green flag drops ! Rikknen is still in the lead with only two laps to go ! 
 Person1:        Smoke is coming out of his car ! He seems to be having engine trouble ! He makes his way into the pit , and Fernando Alonso takes the lead ! 
 Person2:How unlucky for Rikknen , and this race is over ladies and gentlemen , Alonso takes the checkered flag ! 

informal