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. 
 customer: My name is Nicole Turner. I would like to travel from MSP to SFO, could you help me out? 
 agent: Sure, may I know your trip dates? 
 customer: My preferable dates are from 11/23 to 11/25. 
 agent: Sorry, on these dates there is no flights available. 
 customer: That's ok. Thank you for your help. 
 agent: Most welcome.
no_flight