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 David Lewis. 
 agent: Hello. How may I assist you today? 
 customer: Can you please help me with cancelling my recent reservation? 
 agent: Sure, please wait a moment I will check the reservation list. 
 customer: Ok. 
 agent: Thanks for waiting, unfortunately there is no reservation found on this name. 
 customer: Ok, no problem. 
 agent: Thanks for availing us. 
 customer: Thanks for the help.
no_reservation