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. 
 customer: Myself Ryan Jackson. 
 agent: I am here to assist you, may I know your concern? 
 customer: For some issues I want to change my reservation, can you please help me? 
 agent: Sorry, there is no reservation been found on your name. 
 customer: It's ok. Thank you for the information. 
 agent: Thank you for choosing our agency.
no_reservation