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

customer: Hello, I am Rachel Wright. 
 agent: Hello, how can I be your helping hand? 
 customer: I want to change my existing reservation due to some health issues, can you please help me with that? 
 agent: Sure, I am here to help you. Please wait for a while, I will check your reservation. 
 customer: Sure. 
 agent: Thank you for being patience, there is no reservation found on your name. 
 customer: Ok, not an issue. Thank you for your information. 
 agent: Thank you for approaching us.
no_reservation

customer: Hi. 
 agent:  Hello, How exactly I can serve you the best today? 
 customer: I need to change my trip dates in my recent reservation, can you serve me in changing this? 
 agent: Sure, I will help you with that. 
 customer: Thanks. 
 agent: May I know your name to check your details in our database? 
 customer: Lisa Evans is my name, you can check with this. 
 agent: Please wait a while. 
 customer: OK. 
 agent: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name. 
 customer: OK. Not a problem, Thanks for your time with us. 
 agent: Thank you for choosing us.
no_reservation

customer: Hello. 
 agent: Hello, how may I guide you? 
 customer: I am Emily Green. I would like to book a ticket from MSP to BOS. 
 agent: Sure, can I know your preferable dates? 
 customer: I am starting on 06/18 and return back on 06/20. 
 agent: I found a flight 1018 of AA airlines matches with your preferences, can I proceed? 
 customer: Yes, pleas eproceed. 
 agent: Your ticket is booked. 
 customer: Thank you for the help. 
 agent: Thank you, have a good day.
book