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: Hello. 
 agent: Hello. How can I help you? 
 customer: Can you aid me in booking a flight ticket from HOU to IAH? 
 agent: Sure, I will help you. Can you please share me your travelling dates? 
 customer: Sure, I would like to go on July 19th and return back on July 21st. 
 agent: Ok, please share me your name. 
 customer: Myself Stephen Collins. 
 agent: Ok, do you have any connection limit? 
 customer: Make sure it is a single connecting flight. 
 agent: Ok, do you have any other specifications? 
 customer: Make sure it is a normal-cost airline. 
 agent: Here, I found a flight for you with single connection and ticket fare is 200 in economy class. Shall I proceed for booking? 
 customer: Ok, please proceed for further. 
 agent: Your ticket is booked with flight number 1011 and airline is Delta. 
 customer: Thank you for booking. 
 agent: Welcome, have a safe flight.
Output:
book