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, I am Robert Gonzalez. 
 agent: Hello, how may I support you? 
 customer: As my plan to attend a exam so I made a reservation earlier this week but due to technical issues i need to cancel it. Can you help me with this? 
 agent: Sure, let me check the reservation list and get back to you. 
 customer: Ok. 
 agent: We could not find any reservation  by your name. 
 customer: Ok, not an issue. Thanks for your information. 
 agent: Thank you for choosing us.
no_reservation