Q: 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
customer: Hi. 
 agent: Hello, how may I aid you? 
 customer: I am Steven Nelson want to attend a workshop at Denver, can you book a ticket from EWR to DEN? 
 agent: Sure, please tell me your preferable travelling dates. 
 customer: Sure, my travelling dates will be 09/24 and 09/26. 
 agent: The AA airline with flight number 1002 is available having price as 100 and connection as 1. 
 customer: Ok, proceed with my booking. 
 agent: Ok, your reservation is confirmed. 
 customer: Thank you. 
 agent: Thank you for choosing us, have a safe journey.
A:
book