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, I am Anthony Turner. 
 agent: Hello, how can I help you today? 
 customer: I would like to start my journey from Chicago, IL-ORD to attend my family meeting at Dallas, TX-DFW, can you help me in booking? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: I would like to start on 02/27 and my return date will be on 02/29. 
 agent: Do you need a stopover in between your journey? 
 customer: I need a stopover in between my journey. 
 agent: OK, please hold on. 
 customer: Ok. 
 agent: Thanks for waiting, we found 1007 flight in UA airline with single connection and fare of 100. 
 customer: Ok, please book my ticket. 
 agent: Your ticket has been booked with your name. 
 customer: Thank you for helping in booking. 
 agent: Thank you for reaching us, have a safe journey.
book