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

[Q]: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you help me to book a flight from PHL to DTW? 
 agent: Sure, let me know your travel dates? 
 customer: I would like to travel on Sept 26 and 28. 
 agent: Do you have any requirements? 
 customer: I need a connecting flight. 
 agent: Ok, may I know your name please? 
 customer: My name is Sandra Hall. 
 agent: United Airlines has a connecting flight with number 1005 for fare 100, shall I proceed? 
 customer: Proceed with booking. 
 agent: Your ticket is reserve in economy class. 
 customer: Thank you. 
 agent: Thank you for opting us.
[A]: book


[Q]: customer: Hello. 
 agent: Hello, how may I guide you today? 
 customer: I am Stephen Turner, can you assist me to book a flight from DEN to ATL? 
 agent: Sure, could you please share me with your dates of trip? 
 customer: Ok, my travel date is on 01/07 from Denver and return date is on 01/09. 
 agent: Ok, please hold on for a mean while. The flight with the connecting flight of fare 100 has found, shall I book this ticket booking? 
 customer: Ok, please the book. 
 agent: The flight with the Delta airline and flight number is 1009 has been confirmed. 
 customer: Thank you for helping me with the booking. 
 agent: You are welcome and have a happy journey.
[A]: book


[Q]: customer: Hello. 
 agent: Hello, how may I guide you? 
 customer: I am Christine Smith. I would to book a flight ticket from OAK to DEN. 
 agent: Sure, can I know your preferable dates? 
 customer: I am planning to start on 12/15 and return back on 12/17. 
 agent:  I found a flight 1011 of AA airlines matches with your preferences, can I proceed? 
 customer: Yes, please proceed. 
 agent: Your ticket is booked. 
 customer: Thank you. 
 agent: Thank you, have a good day.
[A]:
book