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: Rachel Martin here. 
 agent: Rachel, how may I guide you? 
 customer: Actually I booked a ticket to MSP for a interview, but due to a medical problem I'm unable to attend. Could you help me in changing my reservation to other planned dates? 
 agent: Hold on for a moment, let me check. 
 customer: Ok. 
 agent: Rachel, I am sorry to inform you that there are no existing reservations with your name. 
 customer: No problem. Thank you for your time. 
 agent: Thank you, have a good day.
no_reservation