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. My name is Benjamin Nelson. 
 agent: Hello Benjamin, how can I help you? 
 customer: My health condition is not good. So I would like to cancel my journey. 
 agent: Sure, please wait for a moment. Sorry, there is no reservation found by your name. 
 customer: Its ok. Thank you. 
 agent: Thank you and have a nice day.
no_reservation