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. 
 agent: Hello, how can I help you? 
 customer: Owing to an emergency, I want to cancel my reservation. Can you check whether there is any refund policy on my reserved ticket? 
 agent: Please wait a while, may I know your name please? 
 customer: Sure, my name is Charles Johnson. 
 agent: Sorry to say, there is no reservation on your name in our database. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for opting us.
no_reservation

customer: Hello. 
 agent: Hello. How may I assist you at this moment? 
 customer: Myself Sandra Phillips. Can you please book a flight ticket from SFO to LGA? 
 agent: Sure, may I know your planned dates of travelling? 
 customer: Sure, I need to travel on dates of 04/05 and 04/07. 
 agent: Please wait a moment to check the flights availability. 
 customer: Sure, take your time. 
 agent: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling. 
 customer: Oh! It is sad to hear. Anyway, I will go  with another agency this time. 
 agent: Thank you for approaching us, have a great day. 
 customer: Thank you for your time. 
 agent: Welcome.
no_flight

customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Kathleen Perez. I am planning to visit my cousin's home to attend a birthday party. Can you please help me out to book a ticket? 
 agent: Sure.may I know your airport codes please? 
 customer: Ok, my airport codes are BOS to SFO. 
 agent: Travelling dates please? 
 customer: Sure, my trip dates are 03/18 and 03/20. 
 agent: There is a flight with single connection flight, can I proceed for booking? 
 customer: Please proceed. 
 agent: Your booking is done in 1003 flight. Thank you. 
 customer: Thanks for your help.
book