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: 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.
[EX A]: no_reservation

[EX Q]: customer: Hi. 
 agent: Hello. How may I aid you? 
 customer: I am Eric Lewis. Can you help me in booking from MCO to PHX? 
 agent: May I know your itinerary dates please? 
 customer: My travelling dates are from Jan 8 to Jan 10. 
 agent:  May I know your preferable journey timings? 
 customer: I want to return in the morning time. 
 agent: Is there any another specifications on your trip, so that I can arrange like that only. 
 customer: I need a connecting flight. 
 agent: I got a connecting flight-1023 in economy class, is it fine for you? 
 customer: Ok, please book it. 
 agent: Ok, booking is done on UA airlines. 
 customer: Thank you. 
 agent: Thanks for reaching us.
[EX A]: book

[EX Q]: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Christopher Gonzalez. I want to change my existing reservation due to health issues, can you help me in changing the reservation? 
 agent: Sure, we are here to help you. Please give me a moment to check your details in reservation list. 
 customer: Sure. 
 agent: Thank you for waiting, there is no reservation exist on your name to do modification. 
 customer: No problem, thank you. 
 agent: Thank you for contacting us.
[EX A]:
no_reservation