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. I am Emma Hernandez. 
 agent: Hello, how can I abet you today? 
 customer: I need to attend the meeting about new car design which is held at BOS. Could you please help me in booking a ticket from DCA? 
 agent: Sure, we will help you. When you have planned to travel? 
 customer: My travelling dates are 02/26 and return on 02/28. 
 agent: Ok, may I know your budget please? 
 customer: I can pay up to 500. 
 agent: Ok, please standby. 
 customer: Sure. 
 agent: Thank you for waiting, there is a flight with 1006 number found in UA airlines and the fare is 100. 
 customer: You can proceed with booking. 
 agent: Ok, your ticket has been confirmed. 
 customer: Thank you for aiding me. 
 agent: Thank you for approaching us.
Student:
book