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: Hello. 
 agent: Hello, how can I help you now? 
 customer: Can you aid me to book a flight ticket from SFO to DCA? 
 agent: Sure, please share me your planned journey dates? 
 customer: My trip dates are Oct 13 and Oct 15 respectively. 
 agent: Do you want a direct flight? 
 customer: I prefer for single connecting flight. 
 agent: Is there any other requirement? 
 customer: No other requirments. 
 agent: May I know good name? 
 customer: Anthony Hall here. 
 agent: I found a connecting flight 1005 of airline Hawaiian, fare is 100 and class is economy. Shall I proceed with booking? 
 customer: Please proceed for booking. 
 agent: Your flight ticket has been booked. 
 customer: Thanks for the help.
A:
book