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 Input:
customer: Hello. 
 agent: Hello. How may I aid you today? 
 customer: My name is Roberts Collins, I want to book a connecting flight to meet friend at Houston. Can you book a flight from NY-JFK to TX-HOU? 
 agent: Sure, when are you planning to start and return on? 
 customer: I will fly on 07/09 and return on 07/11. 
 agent: Thank you for your details, there are no flights found with the given details. 
 customer: Thank you for the information. 
 agent: Thank you for contacting us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, how can I aid you today? 
 customer: Can you please help me to book a flight from BOS to SFO? 
 agent: Please provide your trip dates. 
 customer: Sure, I want to travel on Apr 13 and need to return on Apr 15. 
 agent: Do you need any connection limit? 
 customer: I need a flight with single connection. 
 agent: Is there any other specifications? 
 customer: My depart time must be in the evening. 
 agent: May I know your name? 
 customer: I am Virginia Parker. 
 agent: There are no flights available on your routes. 
 customer: Ok, not an issue. Thank you for checking. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. How can I assist you? 
 customer: My visit to the Planetarium has been postponed, due to some technical issues. This is the reason, I want to change my reservation with the name of Carol Adams. 
 agent: Ok, please wait. 
 customer: Ok. 
 agent:  Sorry, no reservation was  found on your name. 
 customer: No, problem. I will check with another option. 
 agent: Thank you, have a nice day. 
 customer: Thank you for your information.

Ex Output:
no_reservation