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. How can I help you today? 
 customer: I am  Carol Williams. I want to book a fight ticket from PHX to ORD. Can you find a flight ticket for me? 
 agent: Sure, may I know your travel dates to search available flight for you? 
 customer: Sure, I am planning to travel on these days that is on 02/02 and back on 02/04. 
 agent: Wait for a minute, to check. 
 customer: Ok, make sure that the connection limit 1. 
 agent: Sorry, I could not find any flight with your connection. 
 customer: Ok, no problem. Thank you for your information. 
 agent: My pleasure.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I guide you? 
 customer: My name is Dennis Davis. I want to travel from DFW to PHL, could you help me in booking the ticket? 
 agent: Yes, please provide the departure and arrival dates? 
 customer: It's from 09/21 to 09/23. 
 agent: I found a flight 1027 of Hawaiian airlines. Shall I book the ticket? 
 customer: Please book the ticket. 
 agent: Ok, your ticket is booked. 
 customer: Thank you for your time. 
 agent: Thank you, have a safe flight.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how may I help you? 
 customer: I want to change dates in my recent reservation, can you please help me? 
 agent: Sure, may I know your name please? 
 customer: The ticket is booked under the name Carol young. 
 agent: Wait a while, Kindly. 
 customer: Sure, I will wait. 
 agent: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking. 
 customer: No issue, anyway thank you for checking. 
 agent: Thank you for opting us.
Output: no_reservation