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

Input: Consider Input: customer: Hi. 
 agent: Hello. How can I help you now? 
 customer: I am Carol Baker. 
 agent: Ok. 
 customer: Can you help me to book a flight from IAD to ATL? 
 agent: Sure, can you please mention the travelling dates of your journey? 
 customer: My trip dates are 04/15 and 04/17. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry Carol, there are no flights found on your requested dates. 
 customer: Oh! ok. 
 agent: Thank you for approaching us, have a nice day. 
 customer: Thank you for your time. 
 agent: You are welcome.

Output: no_flight


Input: Consider Input: customer: Hi. 
 agent: Hello. How may I render you at this moment? 
 customer: Can you please help me with cancelling my recent reservation? 
 agent: Sure, may I know your good name please? 
 customer: My name is Gregory Jackson. 
 agent: OK, please wait for few minutes. 
 customer: Ok. 
 agent: There is no recent reservation found on your name in our records. 
 customer: That's ok, thank you. 
 agent: Thank you for reaching us.

Output: no_reservation


Input: Consider 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.
Output: no_flight