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. 
 agent: Hello. 
 customer: Myself Elizabeth Lopez. 
 agent: What service that you are looking from our agency? 
 customer: There is a urgent business meeting at Houston. Can you please help me in booking the ticket from IAD to HOU? 
 agent: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling? 
 customer: I will take-off 03/21 and again I will be return back on 03/23. 
 agent: Please wait a moment to check the flights availability in your route. 
 customer: Sure. 
 agent: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 is provided by JetBlue airlines. Shall I proceed with this? 
 customer: Yes, please proceed with that. 
 agent: Ok, your ticket has been confirmed in flight number 1000. 
 customer: Thank you very much for reserving the ticket. 
 agent: Thank you for reaching us, hope you have a great journey.
Output:
book