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, how may I be there for you? 
 customer: I am planning to book a flight from HOU as I have a Client meeting at MSP, so aid me in booking. 
 agent: Sure, do you need a way station in between your journey? 
 customer: Yes, I need it. 
 agent: When are you planning to travel? 
 customer: My planned dates are on 04/24 to 04/26. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: Delta airline with flight number 1002 is going on your way and the fare is 200. Shall I proceed? 
 customer: Sure. 
 agent: On what name should I book it? 
 customer: Reserve the ticket on the name of Ruth Green. 
 agent: Your booking has been confirmed. 
 customer: Thank you for helping me. 
 agent: Thank you for reaching us.
book