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

Let me give you an example: 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.
The answer to this example can be: no_reservation
Here is why: 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

OK. solve this:
customer: Hello. 
 agent: Hello, what kind of service your looking for? 
 customer: I want to attend an interview in Houston, HOU. Can you please book a ticket from DEN? 
 agent: Sure, please share me your trip dates. 
 customer: My travelling dates are Oct 7 and Oct 9. 
 agent: For booking, we need your good name. Please mention it. 
 customer: Sure, I am Emma Scott. 
 agent: May I know your class preferences? 
 customer: I am comfortable with any class. 
 agent: Is there any time concern for you? 
 customer: My depart time is morning. 
 agent: Do you need direct flight or connecting flight? 
 customer: I am comfortable with both flights. 
 agent: We found a Delta airline and 1005 is flight number with a fare of 200. Shall I proceed? 
 customer: Yes, please proceed for booking. 
 agent: Your ticket is confirmed with an economy class. 
 customer: Thank you. 
 agent: Thank you for opting us.
Answer:
book