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:       When are we leaving for our field trip ? 
 Person2:Our science field trip is next Monday at 8 a . m . in the morning . Can you mark that on your calendar ? 
 Person1:        Yes , I will write that down . 
 Person2:That will be Monday , December 2nd . We need to start loading the buses half an hour early , so plan to arrive at 7 . 
 Person1:        Yes , I will be there on time . 
 Person2:We will return 6 days later on December 8th . Will someone be picking you up ? 
 Person1:        Yes , someone is coming to get me . 
 Person2:The return bus will leave the campground at 5 p . m . and return to campus 3 hours later at 8 p . m . 
 Person1:        What should we bring with us ? 
 Person2:I am going to post all of that information on the geology club web page . Check it out when you get a chance . See you Monday ! 

formal