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, I am Dennis Mitchell. 
 agent: Hello,Mitchell. How shall I guide you? 
 customer: My business meeting has been postponed, so I want to change my existing reservation. Can you guide me for changing an reservation? 
 agent: Definitely,let me check. 
 customer: Sure. 
 agent: Sorry,no reservation has found on your name. 
 customer: Ok, no problem. Thanks for your service. 
 agent: Thank you for approaching us.
[EX A]: no_reservation

[EX Q]: customer: Hello, I am Paul Gonzalez. 
 agent: Hello, in what way I can be at your service? 
 customer: I want to meet my old collage friends at Boston, can you please book me a ticket? 
 agent: Sure, can I have your airport codes? 
 customer: My airport codes are from IAH to BOS. 
 agent: Ok, when are you planning to travel? 
 customer: I would like to leave between 07/14 and 07/16. 
 agent: Do you have any other preferences? 
 customer: I need a connecting flight. 
 agent: Sorry to inform you Paul Gonzalez, no airline is providing service on your route. 
 customer: Ok, no problem. Thank you. 
 agent: Thank you for choosing our service.
[EX A]: no_flight

[EX Q]: customer: Hello,. I am Ashley Williams. 
 agent: Hello, how can I assist you? 
 customer: I would like to attend for prayers in Ebenezer Baptist Church at Atlanta, ATL. Can you please make a reservation with connecting flight? 
 agent: Sure, please provide your depart date and return date. 
 customer: My depart date is 06/20 and return date is 06/22. 
 agent: Ok, May I know your source point? 
 customer: My source point is New York, EWR. 
 agent: Thank you for providing details, we found a connecting flight in 1002 UA airline with a fare of 100. Can I proceed for booking? 
 customer: Ok, prorceed. 
 agent: Sure, your ticket has been booked. 
 customer: Thanks for the help. 
 agent: Thank you for reaching us.
[EX A]:
book