You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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

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.
Solution: no_reservation
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

New input: customer: Hello. 
 agent: Hello, How can I help you at this time? 
 customer: I need a connecting flight to Las Vegas to attend for baby shower program of one of my relatives. Can you help me in booking a ticket from Dallas, DFW? 
 agent: Sure, May I know your preferable travel dates? 
 customer: I will travel on 12/16-12/18. 
 agent: Ok, please wait. 
 customer: Sure,. 
 agent: May I know your landing point? 
 customer: LAS, Las Vegas is my destination point. 
 agent: We found a Jet Blue 1007 airline, with price 100 available for your journey. 
 customer: Ok. You can go ahead with booking. 
 agent: Your booking is done, with this connecting flight. 
 customer: Thank you. 
 agent: May I know your name? 
 customer: I am Deborah Garcia. 
 agent: Thanks for approaching us.
Solution:
book