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 may I aid you today? 
 customer: Can you please help me to book a flight from LGA to ORD? 
 agent: Sure, on which dates would you like me to book a flight ticket for you? 
 customer: I want to depart on July 10 and need to return on July 12. 
 agent: Do you need a lay by in between your journey? 
 customer: Yes, I need a lay by in between journey. 
 agent: Are there any more specifications? 
 customer: No. 
 agent: On what name, do I need to reserve the ticket? 
 customer: Frank Allen. 
 agent: We found a connecting flight 1009 from Frontier airline with a fare 100. Shall I proceed? 
 customer: Ok, please proceed. 
 agent: Your ticket has been confirmed in economy class. 
 customer: Thank you. 
 agent: Thank you for availing us.
A:
book