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, myself Katherine Green. 
 agent: Hello, how may I assist you? 
 customer: Can you book a flight ticket from IAD to MCO? 
 agent: Yes, sure. Can you please provide me your travelling dates? 
 customer: My preferable dates of travellings are from 02/05 to 02/07. 
 agent: I found a flight with 0 connection limit. Shall I proceed for booking? 
 customer: The connection limit should be 1 and price 200. 
 agent: Flight 1005 with 0 connection limit, which costs 100 in Hawaiian airline. There is no flight with 0 connection limit. 
 customer: It's ok. 
 agent: So, shall I proceed for booking? 
 customer: No, don't book the ticket. 
 agent: Ok. your ticket is not booked. 
 customer: Thank you for your details. 
 agent: It's my pleasure. Bye.
no_flight