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: Hi. Dennis Hall here. 
 agent: Hello. How can I help you? 
 customer: Reserve a flight ticket that is from SEA to CLT. 
 agent: Can you please tell your travelling dates? 
 customer: My travel dates are from 03/18 to 03/20. 
 agent: Sorry, there are no flights available with your requested details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you and have a nice day.
no_flight

customer: Hi. 
 agent: Hello. How can I assist you? 
 customer: I am Anthony Clark. I want to cancel my reservation. 
 agent: Ok, please wait. 
 customer: Ok. 
 agent: Sorry, reservation found on your name to cancel. 
 customer: That's ok. Thank you. 
 agent: Most welcome.
no_reservation

customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: I am Barbara Perez, want to alter my existing reservation due to some personal issue. Please help me out with that. 
 agent: Sure, please wait for a moment. 
 customer: Ok. 
 agent: Sorry, there was no reservation found with your given name. 
 customer: It's ok, thank you for your help. 
 agent: Thank you for opting us.
no_reservation