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

Example 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.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello, how may I assist at this moment? 
 customer: I have to cancel my recent reservation, can you please help me out? 
 agent: Sure, please give me a while. 
 customer: Shirley Miller is my name, please search my flight ticket on that name. 
 agent: Can I know your good name? Ok Miller, there is no reservation showing on your name. 
 customer: Ok, not an issue. Thank you for your information. 
 agent: Thank you for opting us.
Example Output: cancel

Example Input: customer: Hi. 
 agent: Hello. How may I help you? 
 customer: I want to cancel my reservation which is done recently due to some problems, can you please help me? 
 agent: Sure, please wait a minute. 
 customer: Ok, I will wait. 
 agent: May I know your name please? 
 customer: Sure, my name is Margaret Hall. 
 agent: Sorry, there is no reservation found under your name. 
 customer: Ok, no problem. Thank you for your service. 
 agent: Most welcome.
Example Output:
no_reservation