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: Hello. 
 agent: Hello. 
 customer: Myself Scott Collins. 
 agent: How can I help you? 
 customer: I just want to change my existing reservation Because my seminar was postponed can you help me for that? 
 agent: Unfortunately there is no reservation found under your name. 
 customer: Ok, that's fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your services. 
 agent: Have a great day.
Example Output: no_reservation

Example 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.
Example Output: no_flight

Example Input: customer: Hi. 
 agent: Hello. How may I assist you? 
 customer: Can you please help me in booking a  flight ticket from EWR to ORD? 
 agent: Sure. May I know your name please? 
 customer: My name is John Davis. 
 agent: Are you looking for a stopover in your journey? 
 customer: I am looking for a stopover. 
 agent: May I know your name please? 
 customer: I already mentioned above. 
 agent: Any other preferences? 
 customer: No. 
 agent: Tell me your travel dates please? 
 customer: My travel dates are Mar 9th and Mar 11th. 
 agent: Please wait. 
 customer: Sure. 
 agent: Thanks for your patience. I have found Hawaiian airlines which is a stopover flight. 
 customer: Please reserve it. 
 agent: Yes, I have confirmed your flight ticket in flight number 1022. 
 customer: Thank you. 
 agent: Thank you.
Example Output:
book