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 can I support you now? 
 customer: I am Kimberly Roberts. I want to book a ticket from JFK to OAK to attend seminar, can you help me in booking? 
 agent: Sure, please share me your planned journey dates? 
 customer: I am departing on Aug 31 and return on Sep 02. 
 agent: Please mention your connection limit? 
 customer: I need a flight with connection limit 1. 
 agent: May I know your depart and return flight timing? 
 customer: I want to return time in morning time. 
 agent: Do you have any other requirement? 
 customer: I do not have any other specifications. 
 agent: Thank you for the flight details, sorry there is no flight available on your given journey route. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for visiting us, we hope see you again.
no_flight