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 Patricia Harris. 
 agent: Hello, how may I assist you today? 
 customer: I want to book a flight ticket within a price limit of 200 to watch live sports events at MI - DTW from CA - OAK. 
 agent: Sure, do you have any connection limit? 
 customer: I need a connection in my journey. 
 agent: Ok, when are you planning to make your journey? 
 customer: I am willing to start on 09/05 and return on 09/07. 
 agent: Ok, please wait. 
 customer: OK. 
 agent: We found a flight with a fare of 800 in Hawaiian plane and the flight number is 1010. Shall I proceed? 
 customer: Yes, you proceed with it. 
 agent: Sure, your booking has been confirmed in business class. 
 customer: Thank you. 
 agent: Thank you for opting us.
book