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

Q: customer: Hi. 
 agent: Hello, how may I aid you today? 
 customer: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that? 
 agent: Sure, may I know your good name? 
 customer: I am Kevin Clark. 
 agent: Ok, please wait for a minute. 
 customer: Sure. 
 agent: I have checked in reservation list to change your ticket, but could not find any reservation with your name. 
 customer: Ok, no issues. Thanks for the information. 
 agent: Thank you for reaching us.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello. How may I aid you today? 
 customer: I want to change my destination airport code in my existing reservation, can you please help me out? 
 agent: Sure, I will help you with that. 
 customer: Thank you. 
 agent: May I know your name please? 
 customer: Sure, my name is Nicholas Taylor. 
 agent: I am sorry to say that there is no reservation found under your details. 
 customer: It's ok, thank you for the information. 
 agent: Thank you for reaching us.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello. How can I assist you at this moment? 
 customer: I need to travel San Francisco, can you please reserve flight ticket from PHX and SFO? 
 agent: Sure, I am happy to help you with that. Can I have your travel dates please? 
 customer: My travelling dates are Mar,16 and Mar,18. 
 agent: Ok, please let me know the timings of your journey. 
 customer: My depart time should be in the evening. 
 agent: Do you want any connections in between your journey? 
 customer: I need single connection for my travel. 
 agent: Can I have your good name please? 
 customer: Myself Larry Phillips. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Sorry Larry Phillips, no flight is available  to you on your dates. 
 customer: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. 
 agent: Thank you for choosing us, have a good day. 
 customer: Thank you for your information.

A:
no_flight
****