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. How may I help you? 
 customer: Myself Emily Jackson. I need to cancel my recent reservation, as my  planned trip with my friends got cancelled. Can you please  help me out? 
 agent: Please wait for a moment. 
 customer: Sure, I will wait. 
 agent: Sorry, there is no reservation matching with your name in our portal. 
 customer: Not a problem, anyway thank you for the information. 
 agent: Thank you for reaching us. 
 customer: Thank you for your service.
no_reservation