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 aid you today? 
 customer: Owing to an  emergency, I would like to cancel my reservation. Can you help me in that? 
 agent: Sure, I will help you on that. May I know your name to check your reservation status? 
 customer: Frank Roberts is my name. 
 agent: Ok Frank, please hold on to check your status. 
 customer: Ok. 
 agent: Sorry Frank, we don't have any records under your name in reservation. 
 customer: It's ok, Thanks for the information. 
 agent: Thank you for reaching us, have a great day.
Student:
no_reservation