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

Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: Emily Clark here. 
 agent: How may I lend a hand to? 
 customer: I need to have a flight ticket from OAK to AUS for an important business meeting, can you please help me out with booking of a flight ticket on those locations? 
 agent: Sure Clark, When you are willing to travel? 
 customer: I would like to start my journey on 12/29. 
 agent: Just a moment. 
 customer: Sure. 
 agent: Can you please share me your return dates? 
 customer: I would like to return on 12/31. 
 agent: Clark sorry to intimate, no flights are available with your requirements. 
 customer: Oh! Sad to hear that. Anyway, I will contact another agency to go there. Thank you for the information. 
 agent: You are welcome, thank you very much for contacting us.

Output: no_flight


Input: Consider Input: customer: Hi. 
 agent: Hello, how may I aid you? 
 customer: Joseph Garcia here. I would like to spend some more days with my family, so please help me in changing my existing reservation. 
 agent: Sure, I am here to help you out. Please allow me a moment. 
 customer: Ok. 
 agent: Sorry  Joseph Garcia, there is no active reservation on your name in our database. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.

Output: no_reservation


Input: Consider Input: customer: Hi. 
 agent: Hello,. 
 customer: I am Ashley Hall. 
 agent: How can I help you? 
 customer: I need to book a flight ticket to attend a meeting at LAS, Can you please help me for booking? 
 agent: Sure. Please provide your journey dates? 
 customer: I would like to travel on 11/10 to 10/12. 
 agent: Please specify origin airport code? 
 customer: My take off is AUS. 
 agent: Could you please provide journey dates? 
 customer: I would like to travel no 11/10 to 11/12. 
 agent: Ticket is available with flight number 1002, connections 1, airline Delta having price 100. 
 customer: Ok, proceed for booking. 
 agent: Your ticket is booked. 
 customer: Thanks for your information. 
 agent: Thank you.
Output: book