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, how can I assist you? 
 customer: I want to book the flight ticket from DTW to IAH. Can you please help me? 
 agent: Ok, please provide me your name to book a ticket. 
 customer: My name is Cynthia Martin. 
 agent: Please may I know your dates of journey? 
 customer: My travel dates are Mar 7 and Mar 9. 
 agent: Please let me know your preferred connection limit. 
 customer: I need a single connection flight. 
 agent: Please let me know your class preferren. 
 customer: I am comfortable with any class. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: There is a connecting flight available with the airfare 100 and the airlines is Hawaiian. Can I book the flight 1002? 
 customer: Please proceed. 
 agent: Ok, the flight ticket is confirmed and the departure time is 23:00 Hours and return time is 10:00 Hours. 
 customer: Thank you for the help. 
 agent: Thank you for choosing our agency.
Answer:
book