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

Ex Input:
customer: Hi,. 
 agent: Hello. 
 customer: My name is Elizabeth Wilson. 
 agent: How may I assist you? 
 customer: Can you please book a flight ticket with in the range of 200 from Seattle? 
 agent: Sure, may I know on which dates you would like to travel? 
 customer: Sure, 09/12 - 09/14 are my travelling dates. 
 agent: Help me with the airport codes? 
 customer: My source code is WA - SEA and destination code is Houston, TX - IAH. 
 agent: Sorry, we do not found any flights running in your given details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you for reaching us.

Ex Output:
no_flight


Ex Input:
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.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hi. 
 customer: I am Ronald White. 
 agent: How can I help you Ronald White? 
 customer: Prepone plan came into a picture owing announcement of birth of baby boy. So I need to cancel my recent reservation, can you please help me in that? 
 agent: OK. Give me a moment. 
 customer: Sure. 
 agent: Sorry we couldn't find any reservation on your name. 
 customer: That's not a problem. 
 agent: Thank you for reaching ours. 
 customer: Thank you.

Ex Output:
no_reservation