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 guide you? 
 customer: I am Patricia Brown here, I want to reserve my ticket from LAS to ATL, can you please help me? 
 agent: Sure, can I know your preferable dates? 
 customer: Sure, my planned dates of journey are from 11/26 to 11/28. 
 agent: I found a direct flight 1002 of Frontier airlines matches with your preferences, can I proceed? 
 customer: Ok, you can book it. 
 agent: Your ticket is booked. 
 customer: Thank you for your help in booking my ticket. 
 agent: Thank you, have a good day.
Example Output: book

Example Input: customer: Hi. 
 agent: Hello, how can I guide you today? 
 customer: Can you help me in changing my recent reservation? 
 agent: Sure, I will help you. May I know your good name please? 
 customer: My name is Andrew Lopez. 
 agent: Please wait for a while. 
 customer: Sure. 
 agent: Thanks for your time, there is no active reservation found on your name. 
 customer: Ok, No issues. Thank you. 
 agent: Thank you.
Example Output: no_reservation

Example Input: customer: Hello,. 
 agent: Hello, How can I support you today? 
 customer: Please book a ticket to New York, on the name of Janet Davis. As I want to participate in the Bateaux New York Dinner cruise, with my brother. 
 agent: Sure, I will help you with that. Let me know your source point and return date? 
 customer: Source is GA - ATL, Atlanta. I will return on 09/20. 
 agent: Can you share me destination point please? 
 customer: NY - EWR, New York. 
 agent: Can you provide me your departure date for booking? 
 customer: On 09/18, I will start. 
 agent:  Please, stay online I will check the availability and revert to you. 
 customer: Sure, take your time. 
 agent:  Thanks for your precious time. We found Southwest airline fare of 100. Shall I proceed for booking with single stop over flight? 
 customer: It is very comfortable for me, please hold me a seat. 
 agent:  Your ticket has been confirmed with airline number 1019. 
 customer: Thank you for your effort and support. 
 agent: Thank you for opting us. Have a safe journey!.
Example Output:
book