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:       Hello , Sara are you finished packing yet ? Do you need a hand ?  
 Person2:Thanks . Dad , but I can manage it myself .  
 Person1:        Make sure you have your ID card . You will need it while you travel .  
 Person2:Yes , I know . The problem is that I can't find it . Where did you put it ?  
 Person1:        All your important documents and certificates should be in the desk drawer .  
 Person2:Oh , yes , here it is .  
 Person1:        Sara ?  
 Person2:What's up ?  
 Person1:        Did you buy a map ? Traveling can be really inconvenient without one , and you could even wind up lost  
 Person2:No . Dad . We have a tour guide .  
 Person1:        Also , take these pills in case you have any airsickness , and take some cold medicine , too . How about some band-aids ?  
 Person2:No , I won't get sick . I promise . Ok . I've finished . Bye , Dad . See you !  
 Person1:        Take care , dear ! Be careful ! Oh Sara , wait a minute ! You forget your raincoat and umbrella .  
 Person2:Dad , that's all right . I don't think it will rain . And it doesn't make any sense to take that many things on a trip . Besides I like to travel light . Bye ! 

formal