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

Q: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Emily Anderson here. I would like to travel from EWR to meet my brother who was staying in BOS, can you help me to find a flight? 
 agent: Sure, we are here to help you. Can you share me your travelling dates? 
 customer: Thank you. My travelling dates are Nov, 22 and Nov, 24. 
 agent: Do you need any halt in between your journey? 
 customer: Yes, I need a halt between journey. 
 agent: Ok, wait for some time I will check and get back to you. 
 customer: Sure. 
 agent: Thanks for waiting there are no flights found on your details. 
 customer: That's fine, thanks for your information. 
 agent: Thanks for approaching us.

A: no_flight
****
Q: customer: Hello. I am Sharon Johnson. 
 agent: Hello, how may I succor you? 
 customer: Can you please help me in flight ticket booking from SFO to LAS to attend a client meeting? 
 agent: sure, may I know when do you want to travel? 
 customer: Thank you and my travelling dates are 09/19 and back on 09/21. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thanks for sharing your essentials. There are no flights available on your route. 
 customer: Ok, no issue with that. Thank you for your help. 
 agent: Thank you for opting us. 
 customer: Welcome.

A: no_flight
****
Q: customer: Hi. 
 agent: Hello. How can I assist you? 
 customer: I want to book a connecting flight ticket to attend an event from NY. Can you help me? 
 agent: May I know you travelling airport codes? 
 customer: EWR and OAK are my airport codes. 
 agent: Can you please let me know your travelling dates? 
 customer: 12/28 and 12/30 are my travelling dates. 
 agent: May I know your  class preference? 
 customer: I need a business class. 
 agent: Please let me know your name? 
 customer: Myself Ronald Scott. 
 agent: Here is a connecting flight with fare 1000 and 1026 as flight number in United airline. Shall I proceed with booking? 
 customer: You can reserve it for me. 
 agent: Your ticket is confirmed in business class. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.

A:
book
****