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. 
 customer: Myself Eric Anderson. 
 agent: In which way I can assist you today? 
 customer: Can you please book a flight ticket from ORD to SFO? 
 agent: Sure, I can help you in booking flight ticket. 
 customer: Thank you. 
 agent: May I know your preferable travel dates for booking flight ticket? 
 customer: Sure, I need to travel on dates of 06/03 and 06/05. 
 agent: Ok, please wait a moment, I will check flight availability. 
 customer: Sure, take your time. 
 agent: There is a flight available in this route, airline is Spirit and flight number is 1001. Are you ok with this flight? 
 customer: That's fine, please proceed with booking. 
 agent: Your flight ticket is booked successfully. 
 customer: Thank you for your help. 
 agent: Thank you for contacting us, have a nice day. 
 customer: Most welcome.
Output:
book