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 help you? 
 customer: I need to modify my reservation as I am not able to make a journey this time. So, can you help me in changing my reservation to some other time? 
 agent: Sure, may I know your name? 
 customer: Sure, my name is Ruth Nelson. 
 agent: There was no reservation found on your name. 
 customer: Not a problem, anyways thank you for the information. 
 agent: Thank you for reaching us.
Student:
no_reservation