Instructions: 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
Input: customer: Hello. 
 agent: Hello. How may I assist you today? 
 customer: I am Gregory Mitchell. I would like to cancel my reservation as my grandma got hospitalised, can you please help me out? 
 agent: Sure, I am glad to help you. 
 customer: Thank you. 
 agent: Please wait a moment to check your previous reservation. 
 customer: Ok. 
 agent: As per your request, I have successfully cancelled your reservation. 
 customer: Ok, thank you for your services. 
 agent: Thank you for reaching us, have a great day.
Output:
cancel