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. How can I assist you at this moment? 
 customer: I have to cancel my flight ticket reservation due to some office on the same date, can you help me? 
 agent: Sure, I will help you with this. 
 customer: Thank you. 
 agent: Can you please provide the name on which you have made the reservation previously? 
 customer: Sure, my name is Thomas Scott. 
 agent: Thomas Scott, there is no active reservation found under your name in our database. 
 customer: Ok, no issues with that one, thank you for your information. 
 agent: Thank you for utilising our service.
Student:
no_reservation