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 assist you? 
 customer: I am looking for a flight from ORD to DTW, can you render me in booking the flight ticket? 
 agent: Can I know your travelling dates? 
 customer: My trip dates are from Dec 27th till Dec 29th. 
 agent: Please let me know your name? 
 customer: Myself Gregory Wright. 
 agent: Do you need connecting flight? 
 customer: Yes, I just need a connecting flight  and I don't have any more requirement to be met from end. 
 agent: Here is a connecting flight with ticket fare 100 and 1017 as flight number. Shall I proceed with booking? 
 customer: Please proceed with it. 
 agent: Ok, your ticket is confirmed in economy class. 
 customer: Please do mention the airlines in which you have resevered me the seat. 
 agent: I have reserved in Southwest airline. 
 customer: Thank you for your help. 
 agent: Most welcome.
book