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 assist you? 
 customer: I need to book a flight ticket from PHL to EWR, Can you please help me for booking? 
 agent: Sure, I am happy to help you. Please let me know your travelling dates. 
 customer: I would like to travel on 01/11 to return on 01/13. 
 agent: Do you have any stopover in between journey? 
 customer: I need a connecting flight. 
 agent: Is there any other specifications for you? 
 customer: I am comfortable with economy class. 
 agent: May I know your good name? 
 customer: Janet Davis here. 
 agent: JetBlue Airlines is providing connecting flight with the ticket fare of 100 and depart time is 16:00 hours, arrival time is 17:00 hours. Shall I proceed? 
 customer: Ok, proceed for booking. 
 agent: Ok, your ticket is reserved in an economy class and the flight number is 1004. 
 customer: Thanks for your information. 
 agent: Thank you for contacting us.
A:
book