Detailed Instructions: 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: Hi. 
 agent: Hello, how can I guide you for today? 
 customer: Rebecca Hall here. I would like to book a ticket from DCA to IAH, can you please help me with that? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: The travel dates are from 01/24 to 01/26. 
 agent: Please give me a minute, I will check the availability of flights on this route. 
 customer: Ok. 
 agent: There is a flight with ticket fare 200 in UA airlines with a stopover. Is it ok for you? 
 customer: Please proceed. 
 agent: Your booking is confirmed with flight number 1012. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us, have a nice day.
A:
book