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: Hi,. 
 agent: Hello. 
 customer: My name is Elizabeth Wilson. 
 agent: How may I assist you? 
 customer: Can you please book a flight ticket with in the range of 200 from Seattle? 
 agent: Sure, may I know on which dates you would like to travel? 
 customer: Sure, 09/12 - 09/14 are my travelling dates. 
 agent: Help me with the airport codes? 
 customer: My source code is WA - SEA and destination code is Houston, TX - IAH. 
 agent: Sorry, we do not found any flights running in your given details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. Good Evening. 
 customer: I want to change my reservation to other locations for some personal issues. Can you please help me out? 
 agent: Sure, may I know your name? 
 customer: Myself Jonathan Evans. Can I have the information please? 
 agent: I am sorry Evans, there is no reservation found with your name to change. 
 customer: Its great, no issues. Thank you for the information. 
 agent: Your welcome.

Ex Output:
no_reservation


Ex Input:
customer: Hello, I am Eric Taylor. 
 agent: Hello. How can I assist you today? 
 customer: Please make a plane reservation from DEN to PHL. 
 agent: Sure. Do you have any price limit? 
 customer: I can pay up to 1000. 
 agent: Let me know your travelling dates. 
 customer: I would start on 11/01 and return on 11/03 as I have a conference in between these dates. 
 agent: Please, wait. 
 customer: Ok. 
 agent: Thanks for waiting, there is no flights found on your route. 
 customer: That's Ok, thanks for the information. 
 agent: Thank you for availing us.

Ex Output:
no_flight