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. 
 agent: Hello, how may I help you? 
 customer: I am Carolyn King. Can you please help me in booking the ticket from LGA? As I'm planning to visit New York Great Library. 
 agent: Sure, could you please provide your travelling dates to search for the flight? 
 customer: My travelling dates are 05/21 and return on 05/23. 
 agent: May I know your destination airport code? 
 customer: It is a round trip. 
 agent: Ok, please wait for a moment. 
 customer: Sure. 
 agent: There is a connecting flight 1005 with price 100, can I proceed? 
 customer: You can proceed with booking. 
 agent: Your booking is done. 
 customer: Thank you for your quick response. 
 agent: Welcome.
Student:
book