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 can I guide you for today? 
 customer: I am William Campbell, want to travel from LAS to EWR for my business tour. Can you please search a flight for me? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: Sure, I want to start my travel from July 13 and return will be July 15. 
 agent: Do you have any class preferences? 
 customer: No. 
 agent: Are you looking for a connecting flight or direct flight? 
 customer: I am comfortable with connecting flight. 
 agent: Do you have any other requirements that you are looking for? 
 customer: No. 
 agent: There is a direct flight with ticket fare 200 in Southwest airlines with a stopover. Is it ok for you? 
 customer: Ok, please proceed with the booking. 
 agent: Your booking is confirmed with flight number 1003 in economy class. 
 customer: Thank you so much for your help. 
 agent: Thank you for contacting us, have a nice day.
Student:
book