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. Frank Edwards here. 
 agent: Hello Frank, how may I aid you? 
 customer: Due to an emergency, I want to cancel my reservation. Can you please help me for that? 
 agent: Sure, wait a moment to check your previous reservation status. 
 customer: Ok. 
 agent: Sorry Frank, we don't found any reservation under your name. Would you like to ask us anything else? 
 customer: Nothing, thank you for the information. 
 agent: Ok, thank you for reaching us, have a nice day.
Student:
no_reservation