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: Hi, I am John Phillips. 
 agent: Hello, how can I aid you today? 
 customer: I would like to visit at Washington for enjoying holidays, can you help me to book a flight ticket from LGA to IAD? 
 agent: Sure, we are glad to help you. Can you please share me your travelling dates? 
 customer: I am travelling from July 10 to July 12. 
 agent: Do you prefer any stopover in between journey? 
 customer: Yes, I need a stopover in between my journey. 
 agent: Do you prefer to travel in economy class or business class? 
 customer: I prefer economy class. 
 agent: Is there any airline preferences for you? 
 customer: No, I am comfortable with any airline. 
 agent: Do you have any other requirements to be met? 
 customer: No, thanks for asking. 
 agent: Ok, please wait for a while. I will revert you with the best flight. 
 customer: Sure, take your time. 
 agent: Thanks for waiting, there is a flight found in Hawaiian airline with a fare of 100 and the flight number is 1016. Shall I proceed for booking? 
 customer: Please proceed. 
 agent: Ok, your ticket is reserved in economy class. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Student:
book