Definition: 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
Input: customer: Hi, I am Donald Young. 
 agent: Hello,. How can I amend you today? 
 customer: I would like to book a flight ticket to attend international conference about religious festivals to Los Angeles, CA - LAX, so can you book me a flight ticket from Houston, TX-HOU? 
 agent: Sure, we are mirthful to aid you. 
 customer: Thank you. 
 agent: What is the budget for your ticket? 
 customer: I can pay up to 500. 
 agent: May I know your dates of travel? 
 customer: Yes, my travelling dates are 12/27 and 12/29. 
 agent: Please, stay online I will check the availability of plane and revert to you. 
 customer:   Ok, take your time. 
 agent: Thanks for your time, there is a plane found that matches your request. 
 customer: Ok, can you please share the flight details? 
 agent: There is a plane 1006 of Spirit airline with a connecting flight. Shall I proceed? 
 customer: That's perfect, please go with booking. 
 agent: Reservation is done with the fare of 200 for Spirit airline. 
 customer: Thank you for the help. 
 agent: Thank you for opting us.
Output:
book