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

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Jennifer Hall. 
 agent: How can I help you? 
 customer: I want to cancel my reservation, due to heavy rainfall in Seattle, can you help me? 
 agent: Yes, I can help you. 
 customer: Thank you. 
 agent: Sorry to inform you that there is no reservation found on your name. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for contacting us.
Example Output: no_reservation

Example 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.
Example Output: no_flight

Example Input: customer: Hi. Anna Robinson here. 
 agent: Hello. Glad to meet you Anna. How can I assist you at this moment? 
 customer: I have changed my holiday plans, so I want my destination to be changed. Can you help me with the change of flight reservation? 
 agent: Sure, I am here to help you with that. 
 customer: Ok. 
 agent: Please be hold on for a moment and I will check the existing reservation status. Sorry Anna, there is no reservation found under your name to change. 
 customer: That's not a problem. Thank you. 
 agent: My pleasure. Thank you for choosing us, have a great day.
Example Output:
no_reservation