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: I want to modify my destination airport code because the place where I have to go is not near to that destination airport. Can you please help me to change the details? 
 agent: Sure,I will help you with that. 
 customer: Thank you for considering my request. 
 agent: May I know your name please. 
 customer: My name is Christopher Adams. 
 agent: Sorry, there is no reservation on your name in our database. 
 customer: It's ok, not a problem with that. Anyways thank you for your time. 
 agent: Thank you for reaching us. 
 customer: You are most welcome.
no_reservation