Teacher:In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. May I please know your name? 
 customer: Janet Moore here. 
 agent: How can I be of service to you? 
 customer: I want to visit my friend in Los Angeles.Can you please help me for booking a ticket? 
 agent: Sure, I would be happy to help you. Sure, can you please give me your planning dates and airport codes? 
 customer: My airport codes are from CO-DEN to CA-LAX. My departure date is 12/19 and return date is 12/21. Make sure my connections limit is 1. 
 agent: Sure, wait a moment. 
 customer: Ok. 
 agent: There is a flight with price is 200 and airline is UA. Is it ok for you? 
 customer: Please proceed for booking. 
 agent: I have confirmed your ticket successfully. Everything looks to be in order. 
 customer: Thank you for helping me. 
 agent: Thank you for help.
Student:
book