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: May I please speak to Tom ?
Person2:Tom has gone to lunch .
Person1: I'll just try him again .
Person2:Do you want me to have him give you a call ?
Person1: No , but what time do you expect him back ?
Person2:He should be back in about forty minutes .
A:
formal