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: I am  Carol Williams. I want to book a fight ticket from PHX to ORD. Can you find a flight ticket for me? 
 agent: Sure, may I know your travel dates to search available flight for you? 
 customer: Sure, I am planning to travel on these days that is on 02/02 and back on 02/04. 
 agent: Wait for a minute, to check. 
 customer: Ok, make sure that the connection limit 1. 
 agent: Sorry, I could not find any flight with your connection. 
 customer: Ok, no problem. Thank you for your information. 
 agent: My pleasure.

A: no_flight
****
Q: customer: Hello. 
 agent: Hello, how may I assist you today? 
 customer: I would like to cancel my reservation which is under my name. Can you please help me with that? 
 agent: Sure, may I know your name please? 
 customer: My name is William Mitchell. 
 agent: Please wait for a moment. 
 customer: Sure, take your time. 
 agent: Sorry to inform you that, there is no reservation found as per your name in our database. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for reaching us with a query. 
 customer: You are welcome.

A: no_reservation
****
Q: customer: Hello. 
 agent: Hello, how may I aid you today? 
 customer: I need you to book a flight ticket from DTW to SFO. Please help me. 
 agent: Sure, may I know your name please? 
 customer: Helen Turner. 
 agent: May I know on which dates you are willing to travel? 
 customer: July 11 and 13 are my planned travelling dates. 
 agent: May I know your class preference please? 
 customer: I am ok with any class. 
 agent: May I know your connection limit please? 
 customer: Yes, I need a break. 
 agent: Hawaiian airline is providing a connecting flight of fare 200 with economy class, shall I proceed for booking? 
 customer: Yes, please proceed. 
 agent: Your ticket has been confirmed with flight number 1011. 
 customer: Thank you. 
 agent: Thank you for reaching us.

A:
book
****