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 assist you for the day? 
 customer: Please book me a flight ticket from DTW to LAX to meet my family. 
 agent: When you are willing to travel? 
 customer: I have planned to travel on Dec 01st and return on Dec 03rd. 
 agent: Let me know your connection limit? 
 customer: I connecting flight. 
 agent: Do you have any other requirements? 
 customer: No, thanks. 
 agent: May, I know your good name? 
 customer: David Anderson. 
 agent: Sorry, we found no flights on your given dates. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for reaching us.
no_flight