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, may I know your name please? 
 customer: I am George Lopez. 
 agent: How may I help you? 
 customer: I am planning to visit a Funfair exhibition in Houston, could you please help me in booking my flight ticket? 
 agent: Sure, please provide your travel dates? 
 customer: I want to fly on 06/30 and return on 07/02. 
 agent: Please provide your journey points? 
 customer: Source and destination is from OAK - HOU. I would request you kindly, To find a flight with price limit as 200. And connections limit as 1. 
 agent: Thank you for providing your details. Please wait for a while, I will check and revert you. 
 customer: Ok. 
 agent: Sorry there were no flights founds matching with your requirements. 
 customer: Ok, no issues. 
 agent: Thank you for reaching us. 
 customer: Thanks for the information. 
 agent: Have a good day.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how can I assist you? 
 customer: Please help me to book a flight ticket from IAD to ATL. 
 agent: Sure, we are happy to help you. May I know your travelling dates? 
 customer: My journey dates are Mar, 5 and Mar, 7. 
 agent: Do you prefer any break in between journey? 
 customer: Yes, I need a break. 
 agent: Are there any other specifications for you? 
 customer: I need to depart at afternoon time. 
 agent: May I know your good name? 
 customer: Michael Carter here. 
 agent:  Sorry, no flights are available on your journey routes. 
 customer: Not a problem, thank you for the information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight