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 provide service to you? 
 customer: I'm planning to attend my sister's baby shower party, can you book a ticket form IAH to lAS? 
 agent: Sure, may I know your good name? 
 customer: My name is Linda Taylor. 
 agent: Could you please provide your planned travel dates? 
 customer: Sure, my planned departure and return travel dates are 18th and 20th of March. 
 agent: Do you prefer a stopover in between your journey? 
 customer: No, I need direct flight only. 
 agent: Is there any more specifications? 
 customer: No, I don't have any other specifications. 
 agent: Ok, please wait for a couple of minutes. 
 customer: Sure, make it fast. 
 agent: Sorry, there are no flights available as per your requirements. 
 customer: That's ok, thank you for giving the information. 
 agent: Thank you for opting us.
no_flight