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
Q: customer: Hi. 
 agent: Hello, how may I be at your service today? 
 customer:  I want to cancel my recent reservation due to sudden cancellation of my trip. Can you help me? 
 agent: May I know your name please to check the status of your reservation? 
 customer: Donna Davis here. 
 agent: Thank you. Please stay online for a while, I will check your reservation status and let you know. 
 customer: Sure. 
 agent: I have successfully cancelled your reservation and the amount will be refunded to you within 2 business days. 
 customer: Thank you so much. 
 agent: Thank you for reaching us.
A:
cancel