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. 
 customer: I am Gary Carter. 
 agent: How can I assist you Gary Carter? 
 customer: I am unable to travel at this moment due to climate issues, so can you help me cancelling my recent reservation? 
 agent: Sure, I will help you with this. 
 customer: Thank you. 
 agent: Wait a moment please, let me check the database and get back to you. 
 customer: Ok, I will wait for your reply. 
 agent: There is no active reservation found with your name in our database. 
 customer: Oh! I think my sister's already cancelled my reservation, anyway thank you for your services. 
 agent: Thank you for contacting us.
no_reservation