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,. 
 agent: Hello, how can I help you? 
 customer: I am Stephanie Harris. As my cultural fest was postponed, I want to change my existing reservation. Could you please help me? 
 agent: Ok Harris, I will be back with your details. 
 customer: Ok. 
 agent: No reservation found with your details. Thank you Harris, have a nice day. 
 customer: No problem, Thank you for your information.
no_reservation

customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Edward Hernandez, I am willing to have a trip in the month of December in Orlando city for two days. Can you help me with my flight ticket booking from Boston? 
 agent: Sure, may I know your planned travel dates please? 
 customer: Thank you for reacting positively, my planned travel dates are 12/02 and 12/04. 
 agent: Can you please share your source and destination airport codes? 
 customer: Sure, my nearest airports as my source and destination are BOS and MCO respectively. 
 agent: There is a flight available on your requested dates from Frontier airlines with 1 connecting flight.Shall I confirm your booking? 
 customer: You may confirm my reservation with this flight. 
 agent: Your ticket is booked with flight 1002. 
 customer: Thank you for our quick response. 
 agent: You are welcome.
book

customer: Hi. 
 agent: Hello, how can I serve you now? 
 customer: Can you change my reservation? 
 agent: Sure, I will help you to change your reservation. May I know your good name? 
 customer: Thank you. Pamela Hernandez here. 
 agent: Please wait for a moment, while I check for your reservation. 
 customer: Sure. 
 agent: Thank you for waiting, sorry there is no reservation found on your name in our system data. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for visiting us.
no_reservation