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. 
 customer: Jacob Lewis here. 
 agent: What service that you are looking from our agency Lewis? 
 customer: I want to attend a seminar in Washington. Can you please help me for booking the flight ticket? 
 agent: Sure, I am mirthful to help you with that. Can you please help me out with your respective airport codes to go there? 
 customer: My airport codes are from PHX to DCA. 
 agent: Ok, may I know your departure and return dates of travelling? 
 customer: My travelling dates are from 03/27 to 03/29. 
 agent: Please wait a moment to check the flights availability and I will revert back to your with a good news. 
 customer: Ok, I will wait for your response. 
 agent: Based on your travel details, I have found a flight with a single connection with a fare of 100 from Hawaiian airlines. If you are ok with this, please inform me to book the flight. 
 customer: Please proceed for booking the flight ticket. 
 agent: Sure, your ticket has been confirmed in flight number 1002. 
 customer: Thanks for helping me. 
 agent: Thank you for using our services, hope you have a great journey.
Answer:
book