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, how can I assist you? 
 customer: I need to cancel my ticket due to sudden change in my trip, can you aid me in cancellation process? 
 agent: Sure, I am here to aid you. May I know your name please? 
 customer: Amanda wright. 
 agent: Ok, please wait a minute. 
 customer: Ok. 
 agent: Thank you for waiting, sorry no reservation found on your name. 
 customer: No problem, thank you for searching. 
 agent: Thank you for reaching us, have a nice day.
Example Output: no_reservation

Example Input: customer: Hello, David Davis here. 
 agent: Hello. How can I help you? 
 customer: I planned to attend for an event in DCA, can you please help me to book a flight ticket from HOU? 
 agent: Sure, can you please tell your travelling dates? 
 customer: I planned to start on 08/09 and return back on 08/11. 
 agent: For your destination I found a flight with 1 connection and ticket price is just 400 from Spirit airline. Shall I proceed the process? 
 customer: Yes, please proceed to book. 
 agent: Your reservation is confirmed with flight 1017. Have a safe journey. 
 customer: Thank you for your valuable service. 
 agent: Thank you and have a nice day.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. 
 customer: I am Sarah Jackson. 
 agent: How can I assist you, Sarah? 
 customer: Owing to an emergency, I would like to cancel my recent reservation. Can you help me with this? 
 agent: Sure, please wait for a minute. 
 customer: Sure, take your own time. 
 agent: I have successfully cancelled your reservation, Sarah. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us.
Example Output:
cancel