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
Input: customer: Hello. 
 agent: Hello, How can I help you? 
 customer: Can you please help me in booking a flight ticket from PHX to SFO? 
 agent: Sure, May I know your travelling dates? 
 customer: I would like to fly on Aug 30 and return on Sept 01. 
 agent: Do you have any connection limit? 
 customer: I need a single connection. 
 agent: Are there any other preferences? 
 customer: I would like to prefer an economy class. 
 agent: May I know your name? 
 customer: Myself Jeffrey King. 
 agent: You have a connecting flight 1001 in AA airlines and price 100 in economy class, Shall I proceed? 
 customer: You can proceed to booking. 
 agent:  Your ticket has been processed and it will be send to your Email-Id shortly. 
 customer: Thank you. 
 agent: Thank you.
Output:
book