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: Hi. 
 agent: Hello. How may I aid you for the day? 
 customer: Owing to an emergency I want cancel my reservation, can you help me? 
 agent: May I know your name please? 
 customer: Myself Linda Rodriguez. 
 agent: Ok, please wait a moment. Thank you for being waiting. There is no reservation found on your name. 
 customer: No problem, thanks for checking. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: Gary King here, I want to travel from LAX to LAS to meet my friend on her birthday. 
 agent: Ok, Do you need a stopover in between? 
 customer: I need one stopover in between my journey. 
 agent: Please share your travel dates. 
 customer: 10/12 to 10/14. 
 agent: Ok, please wait. There is an UA airline with flight number 1024 is available for you on your requested dates. Shall I proceed with this booking? 
 customer: Yes, you can proceed. 
 agent: Your booking has been done. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Gregory Thomas, I need to travel to Houston, IAH. So please help me to book a flight ticket from DCA. 
 agent: May I know your travelling dates? 
 customer: My planned dates are 07/16 and 07/18. 
 agent: There is a flight available with price 100 and flight number is 1018, would you like to proceed with the booking? 
 customer: Can you tell me the connection limit please? 
 agent: Connection limit is 1. 
 customer: Ok, please book my ticket for this flight. 
 agent: Your booking is confirmed. 
 customer: Thank you so much for your help. 
 agent: You are welcome.
Example Output:
book