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, could you please tell me for what assistance you approached us? 
 customer: Justin Martin this side, looking for a round to HOU for giving a presentation in my company's another branch. Can you help me with that? 
 agent: Sure, I am glad to help you. 
 customer: Thank you. 
 agent: May I know your preferable travelling dates? 
 customer: Sure, it's 02/05 and 02/07. 
 agent: Ok, please tell me from which location you want to travel. 
 customer: I want to travel HOU. 
 agent: Sorry, no flights found as per your request. 
 customer: Ok, not an issue. Thank you for your time. 
 agent: Thank you for choosing us. 
 customer: Welcome.

Output: no_flight


Input: Consider Input: customer: Hello,. 
 agent: Hello, may I know your name? 
 customer: I want to change my existing reservation which is with the name Brenda Smith as my Business meeting got postponed. 
 agent: Please wait for a moment, while I check. 
 customer: OK, sure. 
 agent: Thanks for waiting, sorry to inform there is no reservation found on your name. 
 customer: OK, that's fine. Thank you. 
 agent: Thank you to connecting with us, have a nice day.

Output: no_reservation


Input: Consider Input: customer: Hello,. 
 agent: Hello, how can I help you? 
 customer:  I want to travel from Detroit to Philadelphia. 
 agent: Sure, may I know airline codes and your journey details? 
 customer: Yes, my travel day is from dec/22 to dec/24. My airport codes are  to PA-PHL from MI-DTW. 
 agent: May I know your name? 
 customer: I am Benjamin Brown. 
 agent: OK, please wait a moment I will check and get back to you. 
 customer: OK. 
 agent: Sorry, there is no flights found on your details. Thank you. 
 customer: OK, thank you for the information. 
 agent: Have a nice day.
Output: no_flight