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:       Thanks for offering to give me a lift . I'm looking forward to this party , but I didn't want to go alone .  
 Person2:Don't mention it . It's my pleasure . Have you been to one of these large , sit-down dinner parties since you got to New Haven ?  
 Person1:        No , this is my first . Last week I went to a cookout 5 for new professors at Dean Barksdale's home . I took a taxi because I didn't want to be late . But I was the first one there .  
 Person2:I'll bet you were a little embarrassed .  
 Person1:        You're right . The invitation said two to seven . I was there at two o'clock , but most people didn't arrive until three or four . They didn't start cooking until five o ’ clock .  
 Person2:Cookouts often start slowly . A two o'clock start means you arrive any time after two .  
 Person1:        Thanks for telling me this .  
 Person2:I was late getting back from the mall , but I'm hurrying .  
 Person1:        Why are you in such a hurry ? They said , Dinner at eight , and it's only seven-fifteen . I don't want to be the first one there again .  
 Person2:Don't worry . We won't be the first . 

informal