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

Input: Consider Input: customer: Hello. 
 agent: Hello, how may I aid you? 
 customer: I planned to meet my friend in HOU, can you please help me to book a flight ticket from DCA? 
 agent: Sure, let me know your trip dates please? 
 customer: I prefer to travel on Dec 28 and Dec 30. 
 agent: May I know your connection limit? 
 customer: I prefer to travel in a connecting flight. 
 agent: Do you need any other preference? 
 customer: No. 
 agent: Can I know your name please? 
 customer: I am Amanda Martin. 
 agent: Frontier Airlines is providing connecting flight with the ticket fare of 100 and depart time is 4:00 hours, arrival time is 6:00 hours. Shall I proceed? 
 customer: Ok, please confirm my booking. 
 agent: Your ticket has been confirmed by flight number 1005 and an economy class. 
 customer: Thank you for your help. 
 agent: thanks for choosing us.

Output: book


Input: Consider Input: customer: Hello,. 
 agent: Hello, how can I help you? 
 customer: Can you please help me in booking my flight ticket from DCA to EWR? 
 agent: Sure, may I know your travelling dates? 
 customer: My planned travel dates are April 01-03. 
 agent: Do you have any connection limit? 
 customer: I prefer to fly in connected flight. 
 agent: Any other preferences? 
 customer: I am looking for not to fly in low cost airlines. 
 agent: May I know your name? 
 customer: Stephanie Hernandez is my name. 
 agent: Sorry, there are no flights found with your details. 
 customer: Ok, no issues. Thank you for your service. 
 agent: Thank you.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: Can you please help me in reserving a flight from SFO to reach all the places at DEN? 
 agent: Can I know your travelling dates? 
 customer: Thank you, I would like to start on Nov 2nd and return on Nov 4th. 
 agent: May I know your connection limit? 
 customer: I prefer a flight with single connection. 
 agent: Do you need any other preference? 
 customer: I don't have any other preferences. 
 agent: Can I know your name please? 
 customer: Nicole Mitchell is my name. 
 agent: Sorry to inform you that there are no flights available. 
 customer: Ok, not an issue. Anyways, thank you for the information. 
 agent: Thank you for contacting us.
Output: no_flight