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 may I help you? 
 customer: I want to go to LAX from LGA, so please help me to book a flight ticket. 
 agent: Sure, may I know your travelling dates? 
 customer: My travelling dates are 06/08 and 06/10. 
 agent: Ok, wait for a minute. May I know your name? 
 customer: My name is Linda Collins. 
 agent: Sorry, no flight's found on your details. 
 customer: Its ok, thank you for the information. 
 agent: Thank you for contacting us. 
 customer: You are welcome.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello, how may I render you today? 
 customer: I need your help to book a flight from IAD to DCA. 
 agent: Sure, we are here to help you. Please let me know your connection limit? 
 customer: Thank you. I am looking for a flight with single connection. 
 agent: May I know your good name? 
 customer: Myself Sarah Hall. 
 agent: Could you please share your journey dates? 
 customer: Sure, I want to travel on Apr 26 and need to return on Apr 28. 
 agent: Are there any more specifications? 
 customer: My depart time must be in the evening. 
 agent: We found a connecting flight 1007 from Hawaiian airline has fare 100 and departure time is 2:00 hours. 
 customer: Ok, please proceed. 
 agent: Your booking has been processed. 
 customer: Thank you. 
 agent: Thank you for choosing us.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How may I help you? 
 customer: I am Matthew Parker. 
 agent: Matthew nice to meet you. 
 customer: Due to some reasons, my trip has been postponed. Can you change my reservation. 
 agent: Actually, there is no previous reservation found on your name. 
 customer: It's ok. 
 agent: Thank you for reaching us. 
 customer: Thank you for your help.
Example Output:
no_reservation