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. Amy Jones here. 
 agent: Hello, how can I support you? 
 customer: Can you book a flight ticket for my airport codes that is from SFO to PHX? 
 agent: May I know your trip dates? 
 customer: The trip dates are from 18 June to 20 June. 
 agent: Do you need any break in my journey? 
 customer: Yes. 
 agent: Is there any class preference? 
 customer: No. 
 agent: Do you have any other requirements? 
 customer: No, that is it. 
 agent: May I know your name please? 
 customer: I am Amy Jones. 
 agent: There is a connecting flight with fare of 100 and 1020 flight number. Shall I proceed? 
 customer: You can book the flight ticket. 
 agent: Your seat has been reserved with Frontier airlines in economy class. 
 customer: Thank you. 
 agent: Thank you for choosing our services.
Example Output: book

Example Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Nicholas Martinez. I am travelling from Denver-DEN to Philadelphia-PHL to meet my parents. 
 agent: Sure, can I know the travel dates please? 
 customer: My departure dates is on 06/08 and return on 06/10. 
 agent: Ok, wait a moment please. 
 customer: Ok. 
 agent: There is a flight in JetBlue airline with price 100, can I book it? 
 customer: Please proceed for booking. 
 agent: Your ticket has been booked with flight number 1018. 
 customer: Thank you for your help. 
 agent: You are welcome.
Example Output: book

Example Input: customer: Hi. 
 agent: Hello. 
 customer: I am Nancy Adams. 
 agent: How can I help you Adams? 
 customer: I would like to change my recent existing reservation because my friend who is participating in gun shooting has been postponed. 
 agent: I will help you, please wait a while. 
 customer: Ok. 
 agent: There is no reservation found on your name, Nancy Adams. 
 customer: No problem, thank you. 
 agent: Thanks for opting us.
Example Output:
no_reservation