Q: 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
customer: Hello. 
 agent: Hello, how may I aid you today? 
 customer: I need to reserve a ticket from ORD to PHX, can you help me in doing that? 
 agent: Sure, please share me your trip dates. 
 customer: My trip dates are July 26 to 28. 
 agent: Is there any class preferences for you? 
 customer: No. 
 agent: Is there any time concern for you? 
 customer: No. 
 agent: Please share me your other specifications. 
 customer: I need a connecting flight. 
 agent:  For booking, we need your good name. Please mention it. 
 customer: I am Dennis Harris. 
 agent: We found a AA airlines and 1011 is flight number with a fare of 600. Shall I proceed? 
 customer: Ok, proceed. 
 agent: Your ticket is confirmed with a business class. 
 customer: Thank you. 
 agent: Thank you for opting us.
A:
book