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, I am Joseph Turner. 
 agent: Hello, how may I assist you at this moment? 
 customer: I would like to book a ticket from IAH to ORD. 
 agent: Sure. Please send your nearby airport codes. Please share your travelling dates. 
 customer: Sure, I would like to go on 01/27 and return back on 01/29. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: There is a flight available with Spirit airline, shall I book it?>. 
 customer: Ok, please proceed for further. 
 agent: Your booking is done with flight number 1021. Happy journey. 
 customer: Thank you. 
 agent: Thank you for reaching us. 
 customer: Welcome.
A:
book