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

Q: customer: Hello,. 
 agent: Hello, how can I help you? 
 customer: I am Stephanie Harris. As my cultural fest was postponed, I want to change my existing reservation. Could you please help me? 
 agent: Ok Harris, I will be back with your details. 
 customer: Ok. 
 agent: No reservation found with your details. Thank you Harris, have a nice day. 
 customer: No problem, Thank you for your information.

A: no_reservation
****
Q: customer: Hi,. 
 agent: Hello, How may I help you? 
 customer: I want to book a flight ticket with the name Mark Walker. 
 agent: Sure, Please help me with your journey details? 
 customer: I have planned to travel from Las Vegas, NV- LAS to Oakland, CA- OAK . Also my depart date is on 30th June  and return date is on  2nd July. 
 agent: OK, Do you have any other specifications? 
 customer: I don't have a connection limit but I have a price limit of 1000 and Airline preference as normal-cost. 
 agent: OK, Please wait I will revert you back in a while. 
 customer: OK, Sure. 
 agent: May I know your name? 
 customer: I have already mentioned my name. 
 agent: Sorry for the inconvinience. Thank you for being patience. Sorry, They were no flights available as per your requirement. 
 customer: OK, Thank you for your service.

A: no_flight
****
Q: customer: Hello. 
 agent: Hello, do you need any help from us? 
 customer: Michael Gonzalez here. Can you help me to book a flight ticket from DEN to SFO? 
 agent: Sure, could you please share your departure and arrival day? 
 customer: My travelling dates are 06 Feb and 08 Feb. 
 agent: The AA airline with flight number 1011 is available having fare as 100 and connection as 1, is it ok for you? 
 customer: Ok, proceed with the booking. 
 agent: Ok, your reservation is confirmed. 
 customer: Thanks for helping me. 
 agent: Thank you for choosing us, have a great day.

A:
book
****