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:       Hi , Yang Tang . Come in ! Pretty hot out there , isn't it ? Did you have trouble finding us ? Sit ! Sit !  
 Person2:Hello , Mr . Jones , its ...  
 Person1:        Yang Tang , just call me Fred ! Everyone does .  
 Person2:Ei , OK , er .. Fred . Thank you for seeing me today .  
 Person1:        No problem . No problem at all . Say , it says here in your resume you studied in California . Great place , isn ’ t it ? I studied in California myself . I really enjoyed it . What did you like most about California ?  
 Person2:Well , I ... I guess the weather . And the people . They were all very friendly to me .  
 Person1:        Yeah , the people are quite relaxed ... Those were some great times I spent there . Well , thanks for stopping by . Are you from King Dao , Yang Tang ?  
 Person2:Yes , I am . I was born here , and still live with my parents in the same house .  
 Person1:        Is that right ? Wonderful , wonderful . I've been in King Dao for two years now . A great place . Nice people and great beer ! Well , I guess we ’ d better get started . 

formal