Instructions: 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 may I support you? 
 customer: I am Shirley Martinez and I want to book a flight with a halt to reach Charlotte on Apr 28. Can you please help me in booking a flight from IAH? 
 agent: Sure, may I know your final destination airport code? 
 customer: My destination airport code is CLT. 
 agent: When would you like to return? 
 customer: I intend to return on 30th of the same month. 
 agent: How much can you pay for buying your ticket? 
 customer: I can pay up to 5000. 
 agent: Are you okay with connecting flight or you need a direct flight? 
 customer: I have already mentioned that I need a halt. 
 agent: Is there any priority between economy class or business class? 
 customer: No. 
 agent: At what time do you prefer to travel? 
 customer: I am okay with any time. 
 agent: Please be on hold for sometime, as I can check a flight for your journey with the best airlines. 
 customer: Sure. 
 agent: There is an UA airline with flight number 1012 that leave from IAH and arrive at CLT with a total tariff of 100. Is that fine? 
 customer: Sure, you can proceed. 
 agent: Your request for booking has been processed successfully. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Output:
book