Given the task definition and input, reply with output. 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. 
 customer: Larry Turner here. 
 agent: How can I aid you today? 
 customer: Can you please book a flight from MCO to DCA? 
 agent: Sure, I will help you in booking, can you share me your trip dates? 
 customer: Sure, my travelling dates are Nov 5 - Nov 7. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: I found a flight with the price of 100 and one connection. Can I proceed with the booking? 
 customer: Ok, you can proceed. 
 agent: Your ticket is confirmed with the flight-1004. 
 customer: Thank you. 
 agent: Thank you for reaching us.
book