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? 
 customer: I am Nancy Jackson, want to travel from CLT to MSP. Can you please help me? 
 agent: Sure, let me know your specifications. 
 customer: My budget limit is 1000. 
 agent: Please share your planned trip dates. 
 customer: My trip dates are from 11/11 to 11/13. 
 agent: Unfortunately, there are no flights available based on your details. 
 customer: That's fine, thank you. 
 agent: Thank you for choosing us.
no_flight