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. 
 customer: I am Sandra Evans. 
 agent: How can I assist you today? 
 customer: I want to change my travel dates in my previous reservation, can you please help me with that? 
 agent: Sure, please give me a moment. 
 customer: Ok. 
 agent: Thanks for waiting, there is no reservation found under your name. 
 customer: Oh! May be I am not booked my ticket properly at that time. Thank you for your service. 
 agent: Welcome, have a great day.

Ex Output:
no_reservation


Ex Input:
customer: Hello, I am Deborah Clark. 
 agent: Hello, how can I help you today? 
 customer: I would like to travel from LGA to attend my business meeting. Could you please help me to book a ticket to SEA? 
 agent: Sure, please share your planned trip dates? 
 customer: My travelling dates will be on 07/12 to 07/14. 
 agent: Ok, any other requirements to be met? 
 customer: I need a connecting flight. 
 agent: Ok, please wait for a while. 
 customer: Ok. 
 agent: Thanks for waiting, we found a direct flight, shall I proceed? 
 customer: No, do not proceed. Thank you for your information. 
 agent: Ok, no issues. Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello. 
 customer: I am Gregory Evans from Denver. 
 agent: I am here to assist you, please can I know your concern? 
 customer: I want to go Boston next month, can you please book a direct flight for me? 
 agent: Yes Evans, I will try my best to provide you a ticket with direct flight. May I know your travel airport codes? 
 customer: Thank you, I want to take off from DEN and book my return ticket also on BOS. 
 agent: Please can I know your travel dates? 
 customer: My travel dates are 06/24 and 06/26. 
 agent: As per your request there is no direct flight from your location, sorry for the incoveniences. 
 customer: Oh! It's ok no problem, I will go with another airline. 
 agent: Thank you for availing our service. 
 customer: You are welcome.

Ex Output:
no_flight