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 today? 
 customer: My name is Virginia Garcia, I want to book a flight from CA-SFO to attend a meeting. Can you book a connecting flight for me? 
 agent: Sure, I would be happy to help you. Can you please provide your take off airport code? 
 customer: My source point is CA-SFO and destination is AZ-PHX. 
 agent: On which dates would you like me to book a flight ticket for you? 
 customer: I like to fly on 06/16 and return on 06/18. 
 agent: Ok, please wait a moment, let me search a flight for you. 
 customer: Sure. 
 agent: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions. 
 customer: Ok, thank you for the information. 
 agent: Thank you for choosing us.
no_flight