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

[EX Q]: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am Stephen Moore. Can you please help me in cancelling my recent reservation? 
 agent: Sure, ok. I am sorry no reservation found on your name. 
 customer: Ok, thank you for checking. 
 agent: Thank you.
[EX A]: no_reservation

[EX Q]: customer: Hi. 
 agent: Hello, welcome to flight booking agency. 
 customer: Myself Emma Thomas here. 
 agent: How may I guide you for today? 
 customer: I want to travel from AZ-PHX to CO-DEN, can you please help me to book a flight ticket? 
 agent: Sure, can you please share on what dates you are willing to travel? 
 customer: Sure, my planning of travel is from 03/30 to 04/01. 
 agent: Please give me a minute, I will look for the best airlines on this route. Sorry, there is no flight available on your requested dates. 
 customer: Ok, that's fine. 
 agent: Thank you for reaching us. 
 customer: Welcome. 
 agent: Have a great day.
[EX A]: no_flight

[EX Q]: customer: Hello. 
 agent: Hello. How can I help you? 
 customer: Myself Linda Thomas. I want to visit a trip.I just want to book a ticket. 
 agent: Sure. Help me with the full details of journey. 
 customer: My airport codes are from PA-PHL to NV-LAS. 
 agent: May I know the dates? 
 customer: My dates are from 08/09 to 08/11. 
 agent: Sorry, there is no flight found. 
 customer: Ok, thank you for your help. 
 agent: There is a flight with connection 1 and airline is UA. Can I book it? 
 customer: Ok. 
 agent: Your ticket is booked with number 1029. Thank you. 
 customer: Thank you for your help.
[EX A]:
book