Detailed 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
Q: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you please hold me a flight ticket from ATL to ORD? 
 agent: Sure, I am glad to help you. May I know your planned dates please? 
 customer: My trip dates are Apr 5 - Apr 7. 
 agent: Ok, let me know your connection limit. 
 customer: I prefer a flight with single connection. 
 agent: Ok, please specify your name. 
 customer: Charles Wilson here. 
 agent: Do you have any other concerns? 
 customer: No. 
 agent: There is a connecting flight with a fare of 200 found in 1028 Southwest Airlines, shall I proceed? 
 customer: Please reserve. 
 agent: Ok, your ticket has been confirmed in economy class. 
 customer: Thank you. 
 agent: Thank you for availing us.
A:
book