Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello. 
 customer: Myself Brandon Parker. 
 agent: How can I assist you? 
 customer: Please help me to cancel my recent booking. 
 agent: Sure, i can help you with that. Please wait for a while. 
 customer: Sure, I will wait. 
 agent: There is no active reservation found under your name to do cancellation. 
 customer: That's ok. Thank you. 
 agent: Thank you for choosing us.
Student:
no_reservation