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 help you? 
 customer: I have planned to visit a function in Seattle.Can you please help me to book a flight ticket? 
 agent: Sure, can I know your name and journey dates? 
 customer: My airport codes are LAX and SEA. Sure, I am Paul Williams.I prefer to travel on 01/30 and 02/01. 
 agent: Please wait for a moment. 
 customer: Sure. 
 agent: There is no flight is available as per your details. 
 customer: Ok, thank you for your information. 
 agent: Thank you.
no_flight