Definition: 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
Input: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I am Barbara Jones. 
 agent: Glad to meet you Jones. 
 customer: Can you please book me a flight ticket from San Francisco with fare of 200? 
 agent: Sure, I am here to help you. May I know your airport codes please? 
 customer: SFO is source and CLT is destination. 
 agent: Ok, may I know your travel dates please? 
 customer: I need to travel on 06/05 and return on 06/07. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
 customer: Ok. 
 agent: I found a flight for you with Hawaiian airline and it costs you 100. Shall I proceed? 
 customer: Yes, please proceed. 
 agent: Your ticket has been booked with 1026 flight number. 
 customer: Thanks for booking my ticket. 
 agent: Thank you for choosing us, have a safe flight.
Output:
book