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 serve you now? 
 customer: Can you change my reservation? 
 agent: Sure, I will help you to change your reservation. May I know your good name? 
 customer: Thank you. Pamela Hernandez here. 
 agent: Please wait for a moment, while I check for your reservation. 
 customer: Sure. 
 agent: Thank you for waiting, sorry there is no reservation found on your name in our system data. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for visiting us.
no_reservation