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. How can I assist you? 
 customer: I am Timothy Perez, I want to book a flight from CO-DEN to attend meeting with share holders. Can you book a flight under fare of 200? 
 agent: Sure,  I will help you in booking. Can you please provide your landing airport code? 
 customer: I like to land on AZ-PHX. 
 agent: When you are willing to travel? 
 customer: I will travel on 03/11 and return on 03/13. 
 agent: Please wait a minute, I will search a flight for you. 
 customer: Sure. 
 agent: Thanks for waiting, there is a flight available that matches your requirements. Airline is UA and flight number is 1004 with single connection and price 100. 
 customer: Please proceed with booking. 
 agent: Your ticket has been confirmed. 
 customer: Thank you for helping me. 
 agent: Thank you for contacting us.
Student:
book