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 would like to book a ticket from LAX to IAD, can you please help me out? 
 agent: Can you share your trip dates? 
 customer: I am travelling on these dates May 13th and 15th. 
 agent: Do you need any connections? 
 customer: I need single connected flight. 
 agent: Are there any other preferences? 
 customer: I prefer business class. 
 agent: May I know your name? 
 customer: Emma Lewis here. 
 agent: Sorry, there is no flight found with your details. 
 customer: Ok no problem, thank you for your services. 
 agent: Thank you for reaching us.
no_flight