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. May I know how best I can help you today? 
 customer: Can you please help me in booking a flight ticket from EWR to DEN? 
 agent: Sure, we are glad to assist you in booking. Please share your planned travelling dates to proceed further. 
 customer: My travel dates are from Nov 12th to Nov 14th. 
 agent: Would you like to travel in a connecting flight or a direct flight? 
 customer: I want a single connection in between my journey. 
 agent: Is there any other preferences that you would like to add before booking? 
 customer: No. 
 agent: Please forward your name. 
 customer: I am Robert Evans. 
 agent: Ok, please wait a moment I'll search best flight for you. 
 customer: Ok. 
 agent: Thank you for waiting, we found a direct flight at this moment providing by Frontier airline with the flight number-1013. Shall I book the ticket? 
 customer: Please proceed. 
 agent: Your flight booking is confirmed and ticket has been emailed. 
 customer: Thank you. 
 agent: Thank you for approaching us.
A:
book