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: Please book a flight ticket from LAS to PHL to meet my best friend. 
 agent: Sure, can you please share your journey dates that you prefer to travel? 
 customer: Ok, my planned trip dates are on Jan 19 and return on Jan 21. 
 agent: Do you require any stopovers in your journey? 
 customer: Ok, I need a single connecting flight. 
 agent:  Would you let us know if you have any other preferences? 
 customer: No, I don't have any other requirements. 
 agent: May I know your name for further process? 
 customer: Ok, my name is Robert Parker. 
 agent: Ok, please wait a minute I will get back to you with the flight details. 
 customer: Sure, take your own time. 
 agent: Thank you for waiting, sorry no flights found with your details. 
 customer: Ok, not an issue. 
 agent: Thank you for reaching us, have a nice day. 
 customer: Thank you for your information.
no_flight