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: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Example output: no_reservation
Example explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation
Q: customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Can you please help me in booking a  flight ticket from EWR to ORD? 
 agent: Sure. May I know your name please? 
 customer: My name is John Davis. 
 agent: Are you looking for a stopover in your journey? 
 customer: I am looking for a stopover. 
 agent: May I know your name please? 
 customer: I already mentioned above. 
 agent: Any other preferences? 
 customer: No. 
 agent: Tell me your travel dates please? 
 customer: My travel dates are Mar 9th and Mar 11th. 
 agent: Please wait. 
 customer: Sure. 
 agent: Thanks for your patience. I have found Hawaiian airlines which is a stopover flight. 
 customer: Please reserve it. 
 agent: Yes, I have confirmed your flight ticket in flight number 1022. 
 customer: Thank you. 
 agent: Thank you.
A:
book