Given the task definition and input, reply with output. 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 help you? 
 customer: My name is Benjamin Harris. I want to travel from LAX to MSP. 
 agent: Ok, please provide the travelling dates? 
 customer: The dates of travel are from 11/27 to 11/29. Make sure the connection is 1. 
 agent: Sorry, there is no flight with 0 connection. 
 customer: That's ok. 
 agent: Sorry, there is no flight with 1 connection. 
 customer: Thank you, have a good day. 
 agent: Thank you for reaching us.
no_flight