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, I am Mary Jones. 
 agent: Hello, how can I assist you? 
 customer: I want to attend sports festival with festival in DCA, can you help me with reservation? 
 agent: Sure, may I know your source code? 
 customer: My source is MSP. 
 agent: Help me with the travelling dates? 
 customer: My depart is on 09/26 and return on 09/28. 
 agent: Please be on hold. 
 customer: OK. 
 agent: We have found a flight in an airline Delta with the flight number 1009. 
 customer: OK, proceed with booking. 
 agent: Your flight ticket has been booked. 
 customer: Thank you for the help. 
 agent: Thank you for choosing us.
A:
book