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: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I booked a flight ticket in your agency for my holiday trip to Houston but now I want a change in the travel dates. So can you go ahead and change my flight ticket? 
 agent: Sure, may I know your name to check for the previous reservation? 
 customer: I am Timothy Mitchell. 
 agent: Please allow me a moment. 
 customer: Sure. 
 agent: Timothy Mitchell, there is no reservation found under your name. 
 customer: Ok, not a problem. Thanks for your information. 
 agent: Thank you for contacting us.
no_reservation

customer: Hello,. 
 agent: Hello, may I know your name? 
 customer: I want to change my existing reservation which is with the name Brenda Smith as my Business meeting got postponed. 
 agent: Please wait for a moment, while I check. 
 customer: OK, sure. 
 agent: Thanks for waiting, sorry to inform there is no reservation found on your name. 
 customer: OK, that's fine. Thank you. 
 agent: Thank you to connecting with us, have a nice day.
no_reservation

customer: Hello. 
 agent: Hello. 
 customer: I am Brenda Clark. 
 agent: How may I assist you? 
 customer: Please help me in finding a flight with in price 200. 
 agent: Sure, may I know your airport codes? 
 customer: I need to reach ORD to exhibit my painting sin art gallery and I would be flying form PHX. 
 agent: On which dates would you like to travel? 
 customer: My depart is on 12/19 and arrival is on 12/21. 
 agent: Sorry there is no flight on your details. 
 customer: It's Ok, thanks for your assistance. 
 agent: Thank you.
no_flight