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

Ex Input:
customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Myself Janet Perez. Due to some problems I am unable to travel in flight so can you please cancel my flight ticket? 
 agent: Sure, we are here to help you. Wait for some time. 
 customer: Ok, thank you for your positive response. 
 agent: Thanks for waiting there is no reservation found on your name. 
 customer: Oh! It's ok no problem. Thank you for your information. 
 agent: Thanks for approaching us.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. 
 customer: Kimberly Mitchell here. 
 agent: How can I assist you Kimberly Mitchell? 
 customer: Can you please help me in cancelling my recent reservation? 
 agent: Sure, I will help you with this. I have found your reservation in our database and I have successfully cancelled it. 
 customer: Thank you so much for your help. 
 agent: Thank you for utilising our service.

Ex Output:
cancel


Ex Input:
customer: Hi. I am Brenda Turner. 
 agent: Hello, how may I support you? 
 customer: I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. Can you please help me with changing my reservation? 
 agent: Sure, let me check the status and revert you. 
 customer: OK. 
 agent:  I have checked in reservation list to cancel your ticket, but could not find any reservation with your name. 
 customer: Not an issue, thank you for the information. 
 agent: Thank you for picking us.

Ex Output:
no_reservation