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 can I render you today? 
 customer: I am Melissa Philips. 
 agent: Ok. 
 customer: I would like to watch largest and most complete view of our milky way in galaxy wall at Grainier sky theatre which is located at Chicago, IL - ORD. Will you help me in booking a flight ticket with single connection? 
 agent: Sure, I would be happy to help you. 
 customer: Thank you. 
 agent: Can you please provide your take off airport code? 
 customer: My boarding airport code is WA - SEA. 
 agent: May I know how much do you want to spend on flight ticket? 
 customer: I can spend up to 5000. 
 agent: May I know when you have planned to travel? 
 customer: My planned travel dates are 10/02 and 10/04. 
 agent: Ok, please wait a moment, let me search a flight for you. 
 customer: Sure. 
 agent:  Thanks for your precious time. We found Spirit airline fare of 100. Shall I proceed for booking with single stopover flight? 
 customer: Ok. 
 agent: Your ticket has been confirmed with airline number 1029. 
 customer: Thank you. 
 agent: Thank you for choosing us.
A:
book