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 may I aid you today? 
 customer: My name is Robert Scott, please book me a plane ticket from BOS to OAK. 
 agent: Sure, I will help you with booking, please share your travelling dates? 
 customer: Sure, my travelling dates are from 10/23 to 10/25. 
 agent: There is a flight in UA airline with connection 1 as per your details, can I proceed to booking? 
 customer: I need 0 connected flight. 
 agent: Sorry, no flights as per your details. 
 customer: It's ok, thank you for the information. 
 agent: You are welcome. Thank you for reaching us.
[EX A]: no_flight

[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. I am Emily Walker. 
 agent: Hello. What help do you require from us? 
 customer: I want to change my existing reservation, due to financial issues. 
 agent: Sure, I will check your previous ticket. Sorry to tell you that, I didn't found any reservation on your name to modify. 
 customer: That's ok, thank you for your help. 
 agent: You are most welcome. Thank you for consulting us. Have a good day.
[EX A]:
no_reservation