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. How may I help you? 
 customer: Can you pleas check for the flights from Dec 21 to Dec 23. 
 agent: Sure, what are your trip source and destination? 
 customer: My airport codes are from ORD to DFW. 
 agent: Do you need any connections? 
 customer: Please check for 1 connecting flight. 
 agent: Are there any other preferences? 
 customer: I will be returning in afternoon with economy class. 
 agent: May I know your name? 
 customer: My name is Sandra King. 
 agent: Sorry, there is no flight found with your details. 
 customer: Oh! That's fine. Thank you for checking. 
 agent: Thank you for reaching us. 
 customer: Most welcome.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello. How can I help you today? 
 customer: I am Dorothy Turner, I am going to Washington DC to take tour of White house with my family. Help me to find a flight of price 1000. 
 agent: Could you please provide me airport codes? 
 customer: I will fly from NC-CLT to DC-IAD. Please find a flight with single connection. 
 agent: Sure. To check with availability of flights, I need your travel dates. 
 customer: My travel dates are for depart is 06/29 and returning on 07/01. 
 agent: Please be online, I will revert you with flight details. 
 customer: Ok. 
 agent: Thanks for your time, Delta airline is available with flight number 1015. Can I process the booking? 
 customer: Yes. 
 agent: Ok, Your ticked is confirmed.Thanks for reaching us. 
 customer: Thanks for your service.

Ex Output:
book


Ex Input:
customer: Hi. 
 agent: Hello. 
 customer: I am Thomas Edwards. 
 agent: How can I assist you? 
 customer: Can you help me to cancel my reservation? 
 agent: Ok, I am here to help you. Can you please wait for a while. 
 customer: Sure, please check my reservation details. 
 agent: Sorry, no reservation found on your name to cancel. 
 customer: Oh! ok, no issues. Thank you for your time. 
 agent: Thank you for reaching us.

Ex Output:
no_reservation