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: Hi. 
 agent: Hello. How may I abet you today? 
 customer: Owing an emergence, I want to cancel my recent reservation. Please check the reservation on the name Joshua Harris. 
 agent: Sure, please wait a moment I will check and revert to you. 
 customer: Ok. 
 agent: Thanks for waiting, we are happy to inform you that there is a reservation on this name. Shall I cancel the ticket? 
 customer: You can proceed with cancellation. 
 agent: Your ticket has been cancelled. 
 customer: Thanks for the help. 
 agent: Thank for approaching us.
Student:
cancel