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 Raymond Hernandez. 
 agent: Hello. 
 customer: I need to cancel my recent reservation due to floods occurred in the city. 
 agent: OK. 
 customer: Could you please help me in doing that? 
 agent: Sure, wait a while. I will check your reservation and cancel it. 
 customer: Ok. 
 agent: Thanks for waiting. We found your reservation, and cancelled it successfully. 
 customer: Thank you for your service. 
 agent: Thanks for contacting us, hope to serve you again.
cancel