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. 
 agent: Hello. How can I assist you? 
 customer: Kenneth Jackson here, I would like to change my existing reservation, because while booking I gave wrong airport codes in my previous reservation so can you help me for this? 
 agent: I can help you with that Jackson. 
 customer: Thank you. 
 agent: Sorry, there is no reservation found on your name in our database. 
 customer: Oh! it's ok, no problem. Thank you for your quick response. 
 agent: Thank you for choosing us.
no_reservation