You will be given a definition of a task first, then some input of the task.
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'.

Person1: I'd like to reserve a table for three at 6:30 this evening .
Person2:Let me check . Hold on , please ... Yes , that's fine . Smoking or nonsmoking area ?
Person1: Nonsmoking , please .
Person2:All right . May I have your name ?
Person1: My surname is Gao .
Person2:How do you spell it , sir ?
Output:
formal