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: Hi. 
 agent: Hello. How may I help you at this moment? 
 customer: I am Raymond Adams, can you find a flight on 10/25? 
 agent: Sure, I will find, may I know your airport codes? 
 customer: I am planning for a holiday trip with friends to DCA from LAX. 
 agent: Ok, when you are going to return to LAX? 
 customer: I will be return on 10/27. 
 agent: Ok, wait for a moment please to check availability of flights. 
 customer: Sure. 
 agent: Sorry to say this Adams, no flights as per your details. 
 customer: Not an issue. Thank you for your help. 
 agent: My pleasure, have a nice day.
no_flight