Detailed Instructions: 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'.
Q: Person1: Let me get last week's notes .
Person2:Yeah , sure , you didn't come to class that day ?
Person1: I couldn't come .
Person2:Why not ?
Person1: I wasn't feeling well .
Person2:Here they are .
Person1: Thanks a lot ; are these all the notes ?
Person2:Oh , no , this is the rest .
Person1: Thank you very much .
Person2:It's no problem at all .
A:
informal